<prompt> Human: Alright guys, so I enrolled into a gym about a year ago, and eventually I stopped going surprise surprise but I never cancelled my membership because I was either too lazy, or I had an intention going back. But thats not whats important. A couple months ago my bank cancelled my old debit card randomly and sent me a new one. Since I had a new debit card my the gym wasnt able to automatically charge me because the card they had was no longer valid. Fast forward to this week I get something in the mail from a debt collecting agency in Utah saying that the gym sold them my debt. Which is weird because the gym never made an effort in contacting me to tell me that the method of charging me that they had was invalid. And I never went either so they never told me in person either. How do I dispute this?  <response>: Contact the gym first and see if you can get them to help you resolve the issue.Send the collection company a letter asking them to validate the debt. 