I found myself with two extra tickets to a Elton J...

I found myself with two extra tickets to a Elton John Concert on 10/19/2018 at Madison Square Garden. With the help of a Stub Hub rep. I put them up for sale on Stub Hub site. Within a few days, the tickets sold. I called Stub Hub to get help with uploading my tickets from my original purchase email. They were very helpful and the upload was complete. Me a a few friends went to the concert, and no one showed up for those seats. I hoped all was okay with them. The day after the concert I got an email confirming the payment was on its way. Second day after the concert I got a email saying that there was a claim against my sale because the buyers could not get into the venue with the tickets that I had uploaded onto their site and that I would have to contact the venue for a scan report to verify what happened with the tickets and if I did not get back to them with proof of what happened to tickets within 24/48 hrs, they would charge me the amount of the sale of $1800.00, PLUS $2000.00 in fees.. I never heard of such a thing, I was scared and upset beyond repair. I followed instructions from them directly, how on earth was I supposed to know what the buyers did with the tickets. I know I did what I was instructed to do. Never the less I tried calling MSG and ticketmaster for the so called scan report. I was told they didn't have such a thing and their was not way of knowing what happened to the tickets. I called and emailed for 2-3 days trying to get back in touch with the stub hub rep and she finally called me back on the 4th days telling me she was out of the office, but that I had not met the proof they required and proceeded to withdraw $675.00 (she said in email that because I did try to proof my case, she would not charge me the whole $2000.00) from my checking account and then proceeded later that night to withdraw $1800.00. I had my bank put holds on all accounts until I could find out what on earth was happening.
I am reading online that this is happening with many many Stub Hub sellers. I need help!!!!!