Absa compromised my banking details

Absa motor finance has deducted R3618,35 on the 1st of August and R3603.42 on the 1st of September. I do not have a car nor account with Absa, I called to find out what is happening but I am not getting any assistance. They are telling me they don't how they got my banking details, they have been investigating since last week Thursday. I logged a complain with their compliant department on Monday, I got a response the following day that say we are busy investigating. Their have they are clients document so I do not understand why is it difficult to get hold of those documents submitted in order for them to see if it was their client who made a mistake or was it them. What frustrate me the is nobody is willing to help but they said they do not know how they got my banking details. I never gave them permission to go to my bank account, I have never banked with Absa and I do not think I will ever bank with them.