Bad service

After being with car track for a very long time. I installed tracker to my other car in November. After that they now debiting my account as they please. They debited my account twice in December I phoned them the guy I spoke to he said they duplicated invoices for December and he will cancel the other one but he didn't. I deposited money into my account they debited again I had to call again with my airtime. I didn't get turnaround time when I will receive my money. No follow up no nothing. I got bad service from car tracker so I guess I will have to reverse with my bank and hoping they won't debit my account or see any reversals on my account because I can't keep on paying reversal fees for car tracker. And still it's my time and petrol that will go to waste because of them