My broker mistakenly sold $13K worth of stock today for an $800 margin call. I called them (about a minute after it happened) and they offered to restore my positions. As far as I can tell, by watching the trade log, this means they bought at market rather than busting the erroneous trades. (They did bust a pair of erroneous trades they made - incorrect quantity - when they were trying to restore the positions). I'm not happy about this because these were long-term positions, and now the tax consequences are going to cost me if I don't hold them for another year. Can the broker bust the erroneous trades, or am I out of luck?