It is very easy to fix MOST visa problems. Usually, most visas can be fixed and you can stay in China. Only group visas are difficult and usually can't be fixed, but all other visas can be extended or changed.

It is simple, get your company to stamp some documents, have a about 2000 RMB, and have an AGENT.

The visa agent is the key, in the big cities, there are some special people who are agents who specialize in all visa problems. They can easily fix these troubles.

The people who say you must go to HK or you must leave China, they obviously don't know the secrets of getting the visas.

If you know a good agent, you can fix the problem through them.