StubHub review: Tickets

I posted a pair of tickets and a duplicate account was accidentally created using my apple ID. So the pair of tickets were posted twice. I did fulfill the order and transfer the tickets in the account I knew about and Stubhub is withholding $1,700 from me, claiming I did not fulfill my order. There were only ever 2 tickets. I called several months before the event and found out I had two accounts and was assured it wouldn't be an issue and I would get paid. Stubhub waited to cancel the duplicate account order until right before the event and are penalizing me based on tickets that never existed. They should have known they were the same exact tickets, cancelled the accidental posting and notified the interested buyer that the tickets were already sold. Instead, they did nothing and kept reassuring me everything was fine every time I called. I communicated my concern upon receiving emails about unfulfilled tickets and possible penalties. They eventually escalated the concern after the event passed and I did not get paid. I'm now out $1,700 because Stubhub failed to handle the issue internally.