Zero Accounting skills HARASSMENT

So here goes what is not so complicated but it seems to be for the accounts department and Cartrack. Almost impossible to get threr little minds around. I bought a car in October last year. It was fitted with a tracker. Cartrack had my info I don't actually recall a phone call they start debiting my account every month great. Except one little issue nobody confirmed a debit date with me so ASSUMED the 25th is just ok. Which it is not fine cause I don't get paid the 25th. And all my debits are set for the last day of the month or the 1st. So anyway they debit away costing me bank charges every month because there isn't always money for it . So finally last month I emailed to put a stop to this and change the date to the 1st. And great the debit goes off on the 1st of July but then the cheek of these people debit me the second again so I reverse the debit why am I paying two installments for one month. Well let me tell they have emailed called me everyday more than once whatsapp me daily even though I don't owe them a cent frustrated last Monday I speak to the TEAM LEADER IN ACCOUNTS we go through from Jan to date she realizes its their mistake sorry she will sort it out now like **** that conversation didn't happen and the calls whatsapps have not stopped. So can someone do maths there it's really simple.I am now beyond annoyed.