Deposit not paid back and money taken off my acc for so said damages

VERY BAD EXPERIENCE TWICE NOW. 1ST TIME AVIS SAID CAR WAS NOT FULL WITH PETROL AND WITH INSPECTION IT WAS INDICATED IT WAS. 2ND TIME THEY SAY I DAMAGED THE WHEELCAP AGAIN AFTER INSPECTION SAID ALL 100% SYDENLY R1003 WAS TAKEN OFF MY ACC AND THEY STILL HAVE NOT REFUNDED MY R2000 DEPOSIT AFTER FNB CONFIRMED THERE IS NO REFUND ON BALANCE OF R2000. WELL DONE AVIS MONTANA WONT USE OR REFER YOU TO ANYONE AND GOING TO CANCEL CAR RENTAL AT INSURANCE