Unauthorized Debit from account

<p>Good Day, </p> <p>I rented a car on the 2nd of April 2017 for 5days, brought back the care on the 9th. Which included the rental and deposit, which was fine the deposit was credited back to my account. Issues were the consultant did not explain that the cheque card works differently to the credit card. Avis went and debit my account again and left my account into - status (Which is affecting my credit record), cool we sorted that issue out. I went again rented the car on the 14the of April which it included the deposit and rental, We had a bit of disagreement with the consultant about the money I should be paying well we came t an agreement, I settled my Rental which was R6404,25. Because Avis things I have money they go again and debit my account the same amount, and leave my account in a negative status AGAIN. The issue now is they still investigating this matter, my point is before they even went to debit my account again, why didn't they check before if the rental was settled?, I would appreciate to get feedback asap, cause now i have been waiting for feedback which I have been told several times that they not sure when will this matter be fixed. </p> <p> </p>