I worked as a consultant a Chinese company and we had a confidentiality agreement and written agreement (hand note signed) about ownership and patents applications and royalty payment. After I disclosed multiple designs, each time response was that my design is no good. A year and half later I found out that they had applied for US and Chinese Patents without my name as inventor and got issued, even though I immediately informed the company to correct the error. At first they said they will pay me $5000 as I am considered a good friend. They told me they manufactured and sold in small quantity to some one they don't tell me and that the design was no use to them. I said then assign to me and also make correction to error. Now they started saying I have nothing to do with the design and the patent. To protect my priority date and first to invent I did file provisional application each time I sent the design. I asked them if should go ahead with patenting. But I did not file for non-provisional. What are my Option?
I can see a few issues which I will briefly discuss, though this is more of a long comment rather than an answer. This is very much a case where a patent attorney or lawyer should get involved.
Who owns the invention?
You have an explicit agreement about ownership with the company, which should make this clear. Without seeing the agreement, I can only speculate.
So that's what I'll do. I would expect that you have already agreed that the company owns the rights to the inventions. In that case, it is really up to them whether and how they wish to patent it.
Can you be added as an inventor?
Yes. You cannot assign away your right to be named as an inventor. However, just being named as the inventor doesn't really give you any rights, it just lets you see your name on the document. See this question and the answers for details.
What is to become of your patent applications?
Assuming you have agreed that the company owns the invention, you probably did not have the right to file your own patent applications for it. In any case, if you failed to file a non-provisional after a year, you have probably lost your rights anyway, so it's a moot point.