no, that's just not true, In my case all the cost basis numbers were printed on the form I filed. I just simply read the numbers off the return to them and they adjusted their mistake.the tax code is an abomination.
almost certainly you failed to properly fill out the form.
i spend way too much time on making sure my taxes are right, always do it myself, and have never had a problem.
The girl was a real bitch, she kept dogging me because I wouldn't round up or down. Like I would say, "32,248.23" and she would say "Just round down, that's 32,248."
According to them, every mutual fund I sold had a cost basis of zero. And I imported from Vanguard directly to turbo tax.