Deregistration

I have reached all levels of frustration, countless phone calls, and endless emails. I registered 2 February 2022 at Stadio tried everything to get help with delivery of books and helping to activate my student email account but now one rep****... I phoned finance department to deregister and 2 weeks after my phone calls and emails send to them 2 weeks later one of Stadio's finance department consultants corresponded to say that I must fill in a deregistration form which I did and I have proof of email correspondence from them saying my ticket is resolved and I'm no longer on the system. A few months later they tell me that I did not deregister within 14 days (which was not the case because they did not respond to me within the 14 days) Now they sending me letters that I'm in arrears with R21 000 which I cannot afford because I'm jobless and secondly I do not owe them because I deregistered in time they just did not responded to me in time... I feel disgusted