BAD/FRUSTRATING, SUCKING service

on the 21/09 I rented a car at Hertz Sandton eye, the consultant by the name of FIFI was just not on point, and after driving out I notice the fuel was not full. I returned the car on the 22/09 till to date still not received my deposit and when I call or send an email to customer service I am not getting any joy with this i know that it takes 7 days to release the deposit now they telling me 21 days. This is a very disturbing and frustrating service, I will never ever hire a car with Hertz anymore, I normally use Woodford which i never had an issue with.