Your severance pay depends on how long you've worked there.  If it's been 1 year, a month would be correct.

If they were taking our social insurance, the probably also took out unemployent insurance.

For both of the above, consult with your local labor bureau.

You need to get a new job lined up ASAP.  When your contract ends, so does your work permit.  When your work permit ends, your residence permit will get cancelled very quickly (even if the res permit has a longer duration, the cancellation will make it invalid).  You can apply for a Stay visa to remain longer, but that would be limited.  No matter what, make 100% sure you are not in China without an active Res permit or visa of some sort.  Even a 1 day overstay comes with penalties and will make any new visas difficult (or even impossible) to get.

If you can't find a new job that will give you a work permit and arrange for a new res permit, one option would be to head to HK for a few days.  Then you can come back in on a tourist visa to continue your job hunt or if a new employer is already lined up, they should provide paperwork to you for a Z visa.

There are some possible new visa types in the pipeline, but I don't think those will be available in time to cover you.

A neighbor twice saw Mango with dead rats.  Either or both may be overlaps of the two prior confirmed kills, or they may be separate.  Street sweepers come by several times per day, so there may be additional kills that were not reported.

And Mango doesn't appear to be killing all by himself. 

My lovely wife spotted Mango and Pear playing around her scooter and running under its cover and out again.  A bit later, we went out and there were fresh blood stains and a rat corpse next to the scooter.  Closer inspection revealed multiple blood stains inside the scooter's cover.  It looked like a scene from a Quentin Tarantino movie scaled down to rat size.

Rats are much more rare in the village as they were when I first moved in.  If these two little bundles of rodent-murding cuteness keep up their killing spree, my section of the village will run out of rats pretty soon.

Stripy Emperor and Bronze Cat spent some time consulting before giving Mango and Pear a commendation for their action and also granting them both the additional title of "Slayer of Rats."

Since Bronze Kitty got promoted from outside car/guardian of the front door to inside cat/guardian of all entrances and exits, there hasn't been an official guard downstairs.

Then an orange and white kitten showed up and started guarding not only my prior house's front door, but also the front door of my building and the building on the other side of my prior house.  Bronzy and Stripy agreed to let him have the job (official title is Guardian of the Front Doors), so he was taken to the vet and got "fixed", plus an ear trim.  Someone next door even put a box by the door for him to sleep in.  A few weeks later, he was looking slight ill and the next day he didn't have the energy to get out of his box.  He also had a younger kitten in the box with him suffering the same thing.  It turned out to be the dreaded cat plague/cat parvo, the same disease that almost got Stripy Emperor and that ended poor Penguin's chances of recovering from his injuries.

My decision making shifted from picking a name for the new cat to which internal organ will I sell to pay for this.  They both spent a couple of months in isolation at the vets.  Happily, both survived.  The vets sent multiple pics and videos every day.  Since the big one was orange, they sometimes referred to him as Mango.  The other is mostly white and was occasionally referred to as Pear. 

It was touch and go the first week and then a long slow recovery.  Sadly, both also have a lung infection that will give them congestion and sneezing any time their immune systems are over-challenged, and there's no cure.  So, as much as I'd love to have 2 more balls of fur inside, they are permanent outdoor kitties now. Finally, we brought them back and gave them a new box. I decided we'd just keep Mango and Pear as names (with approval from Stripy Emperor, of course).

And the very good news.  They've been happily living outside and spend a lot of time sitting in the box.  Both got their final does of cat-parvo vaccine on the weekend.  So, they may have cold-like symptoms from time to time, but they won't be able to catch or spread parvo any more.

Now we're waiting for Pear to get a little bigger before he goes to the vet for neutering and an ear trim.  Pear was also appointed as Assistant Guardian of the Front Doors.

Since resuming his post, Mango has been given 2 commendations for killing rats.  Rumors that he found them already dead and was just carrying the corpses around are just lies spread by one of the dogs in the neighborhood.

Thanks.