Please refer to my answer that was provided to a similar question, except that in that case the company that issued an erroneous 1099-Misc went Defunct.
In your case, you need to mention that "You attempted to contact the employer to correct the 1099-Misc and that the employer was not being cooperative at all, to file an amended 1099-Misc report".
Further that you have all copies of the payments made to you and so, the adjustment you are making to the Gross 1099-Misc report is reasonable and valid.
But, please report the entire amount received followed by an item called "Adjustment to 1099-Misc". Also, indicate See Note 1) and attach this note to the tax return with my comments above. Incorrect information on 1099