Not happy with the service

You don't even deserve a star. So last year around November I got charged for three replacement of the tracking device which I didn't mind to pay. I made an arrangement to pay over 3 months. But yhooo it was like I had killed a person the way I was receiving calls? Whatsapp messages and emails that I'm owing. OK fine I paid the first 400, 3 days after I paid 400. I'm left with one installment which they were going to debit on the 6 of Jan. So Jan they debited the 210 the following day 297 for a reason known by them. There was an outstanding amount of R86 yhooo from then I never had peace because of the messages I have been receiving every day. If it's not messages it's calls because of 86 rand. OK fine now it's February my account got debited twice R297 and R210 for a reason i don't don't know. A beg before I make a scene also someone needs to return my money.