******** & Regular Billing of Account

Rented a car from avis Knysna in october 2014, car was returned in excellent condition and all deductions re the rental were debited from my account , now months after that transaction i get regular deduction on my account from avis for no reason, i'm even incuring bank charges and a negative bank profile because sometimes they debit when there are no funds and the payment dishonours ******** ACTIVITY on my account