I wouldn't bother getting them to change the 1099-MISC.
Don't even bother to enter the 1099-MISCs into the program, just enter how much income you received. If the combined total of all 1099-MISCs is larger than what you actually received, enter the combined total of the 1099-MISCs. Then as ann "other deduction" (on Schedule C, assuming this is for your business), report the difference as a deduction, and call it "Incorrect 1099-MISC", or "Timing Difference".
