Double debit and yet i already paid to their account

Cartrack is very *********** i'm not impressed with their service i even regret why i joined them. They double debited my account today the first debit was at midnight the second one this evening for the areas while i already made a payment in their account today. I instructed these people to double debit last month and they did not do that instead they kept on harassing me.And this was their faulf from the beginning i gave them instructions to debit on the 25th but they decided to debit on the last day of the month. Now im left with no other option but to reverse 1 debit order because i made a payment to their account. I recently heard people complaining about them i wish i knew before about this.I never experienced such things with tracker and Ctrack i just changed because i wanted a panic button.