Tracker issue

I joined Tracker in 2020 for a 3 months contract. I paid it as agreed, now they are telling me i owe the company money that was not part of the agreement. I call to check what was happening and I'm told to contact their legal team because the account is with them. When i ask for what was this account handed to them i don't get the answers or help. I am very disappointed with them, definitely will be moving to another tracker