I bought 2 concert tickets in April 2018 for a con...

I bought 2 concert tickets in April 2018 for a concert in Tampa in November 2018. We could not attend and sold the tickets back on StubHub a few days prior to the show. We received an email confirming that they were sold and the sales amount appeared back in our bank account a few days later. Fast forward to January 2019, I gert an email from a COLLECTION AGENCY claiming that I owe $698 for an outstanding balance to StubHub. I called StubHub's customer service and was told that there were two postings for the same e-tickets that both sold despite showing only one listing on my account page on the website. These tickets were apparently for a November 2019 show. I had no idea that there were multiple listings as there was no indication of such according to my account. StubHub claims that there were emails sent claiming such among the (literally hundreds) of spam, solicitation emails sent to my spam folder. Sure enough, these emails started appearing this past fall, well after the initial transaction a year prior. The "supervisor" with whom I spoke said that my outstanding debt had been sold to collections and that there was nothing left to do but pay the nearly $700 dollars to save my credit score. I will be contacting an attorney as well as the Better Business Bureau with my complaint.