Terrible service from Tracker

I had a very bad incident with Tracker. My debit order went off every month until my contract expired. I got a call stating that i am overdue on payments after my contract period ended. I spoke to one of their consultants wich was very rude.... I cancelled my account. I received a black friday special sms stating that i would get 50% off my outstanding account if paid before 30 November 2020. I paid the amount but now im receiving treats from lawyers. Tracker is absolutely the worst company to do business with.