deduction of money without verifying facts

so i was renting a car from Avis, then i return it on 6 march 2015, the expiry date at 1:30. <br> at 16:36, Avis debits my account for R753.21. now, i wonder why in the world but i was unable to call and ask why, so i go to the branch the next morning and i am told that i had not returned the car. okay...so i tell them i did and they say they tried calling me to find out when i would be returning the car because it was due back the previous day and since the car was nit returned, they extended my lease till Monday. i received no calls from Avis, no sms either and i had returned the car. it turns out, someone did not record on the system that the car had been returned but the car was already with dispatch on the Saturday morning. so the car was moved but it was recorded as being returned...no guys, come on, <br> i called the Avis contact centre and was told it will take about 3-7 working days to reimburse me and then I was transferred to Client services, so they can try speed up the process, but instead of transferring me, they hang up on me.<br> I'm appalled that something so small yet with such dire consequences could happen with such a reputable company. why can't my money be returned now