Originally Posted by
sydneyracquelle
Dispute it with your credit card company but DL might ban you.
How can you possibly advise this based on the (lack of) facts provided by OP. It is entirely likely that the fare is valid.
Need a lot more facts from OP before next steps can be advised. It seems entirely possible that DL issued a new ticket and that the old one may still have some value. If the call was "recorded" DL might be able to verify what exactly OP agreed to. But, the bottom line is that if he simply was not paying attention but agreed to whatever it was, including the ticket price, the chances of DL doing anything are slim.