Mutual Fund Co error from 1998 that they won't fix!!!

[Guest swilsonw]

A major mutual fund company made an error on my 1998 tax reporting that I didn't catch until now. They are refusing to correct this error becuase of the time frame invovled. They say that my "due diligence" has kicked in and it was my responsibility. At what time did this responsibility become mine and not the mutual fund company's since they were the ones at fault? I'm look for an IRS code or regulation that specifies how long the mutual fund company is responsible.

Thanks!!!