Complaint: Debit orders for Cartrack

I am very dissapointed in cartrack. I has been three months now that I have been struggling to get them to debit my account after the 20th of each month as per my contract with them. Now there is two debit orders one for the 17th and one for the 21st and if i cancell the one for the 17th my debit order for the 21st does not go off. they have this condition that if your debit order does not go off they do not track your vehicle if it gets ******, but what if they are the cause of the debit order issue. I would like to have Cartracks feedback on this issue