"they said they dont issue correction"

That would tick me off.

I would have the client email HR, and if possible, "cc" the CEO, Vice President, etc. of the company with something like this:

You have informed me that you filed an incorrect legal document (the 1099-R) with the federal government (the IRS) and that you are refusing to correct it.

If you will not correct it, I will be forced to inform the IRS of your refusal to correct the legal document that you filed with them.  Are you sure you want me to do that?  You may want to discuss that with the company's lawyers before responding to me.