Cartrack looted my account - double debited my account

Cartrack debited my account twice, and I have called them to correct this (spoke to Nombuso who asked that I send them bank statement showing the amounts debited and I did). Now they are not responding to me as to what happened and I told her that it was urgent that they correct this as I have other services that needs to debit my account and their debit orders will now bounce because of insufficient amounts since they debited my account twice.