Good at taking money, not so good at refunding

Rented a car from Avis on Friday the 29th of April 2016. I was asked to pay a security deposit of R2200. I inquired when the deposit will be paid back after return of the vehicle and was told 2-3 business days. Vehicle was returned on the Sunday and I phoned Avis on last Thursday as the deposit was not yet refunded. The person over the phone told me that it takes 5 business days. I asked him why the supervisor at Avis at the airport told me 2-3 business days and was told there might have been a misunderstanding. He then said that he will look into it and make sure it is done "tomorrow or the day thereafter". Today the debit order for the rental payment deducted from my bank account and still the deposit remains safely in the hands of Avis.