Deposit not refunded

We toke a car under our insurance and we paid a deposit of R2000 which we were told it's refundable. It's been more than 7 working day still no refund and when we contacted avis we were told it's still under authorization or reserved by the bank which is a lie because we contacted the bank and we were told it was released to avis immediately and there no money under authorization or money that was released to us. Avis is using the credit card so that they can lie and say they've reversed the funds which is not true. Avis is quick to deduct money for e-tolls and don't even pay back the deposit. People please refrain from paying using credit card rather pay cash which is more but guaranteed to get it back. Avis please pay back my deposit.