Billing complaint

I have been with cartrack for well over 5years never had any incident whereby I needed their assistance. Now recently, they debited my account 3 times in 1 month, this debit comes after I made an eft payment for the same month, meaning I paid 4x for a single month. I enquired with their customer service and it seems like they are all clueless of what is happening. They keep on giving different reasons and refuse to refund me what is due to me. Very very disappointing service, even the supervisor I spoke to was not helpful at all. They never want to give their names so you don't know who you are talking to. Very poor customer service from cartrack call centre and whatsapp agents