Refusal to cancel & Unauthorized Debit Orders!

I have tried to cancel this service more than once.

I was retrenched end of June, every rand right now has to go towards bills and food. Cartrack for me isn't a priority. The debit order has bounced numerous times. I have requested cancellation. Today I got a phone call from ABSA losing it due to Cartrack keep trying to take a debit order when the account is already overdrawn. I was very rudely told by ABSA to communicate with Cartrack re debit order, I then emailed Cartract just to get an undelivered response. I then used the WhatsApp line to communicate that I want to cancel the service. I was then informed that someone will phone me. That never happened. I then WhatsApped again. The person said I need to pay 3 months in advance in order to cancel. I said that is not acceptable. I was then told those are the terms. I informed the person that I was retrenched and my account is overdrawn. How do you expect me to pay 3 months in advance with money that I don't have right now from a bank account that is overdrawn due to penalties because you keep trying to take debit orders from my account. This is not acceptable! You are causing so much costs for me due to your lack of service! I have informed you in June that I want to cancel!