Edgars incompetency!!!

Edgars contacted me mid August to inform me that my account was overdue. I informed them that I do not owe anything to my knowledge, because I had paid up the account last year and had not used it in 2020. Mind you, for some reason, they had not sent me my statements for the past two months prior to the call. I later realised that they sent me a statement for July (which was emailed a few days before the collections call). The statement showed that I owed R3000+ I then informed Edgars that I needed to see the missing (undelivered) statements because the last statement I received before the July one showed that my account has 0.00 balance owed. I finally received the statements and saw that they account was used in JHB. I have been in Cape Town the whole year with my card in my possession. Informed them that this was a ***** act. They asked me to complete a dispute form, I went to Edgars blue route and they completed and emailed the form with the relevant documents to Edgars collections on 22 Sep. Edgars still had the audacity to send me a breach of contract letter stating that they have recorded the situation to the credit bureaus even though the investigation in underway! This is completely unacceptable!!! On top of that, throughout this period, I have been receiving calls every second day by collection agents, and each time I had to spend 10 mins explaining the same thing!!!!