Poor services from Avis

I am Ramaite and had the experience to use an Avis hired car for 10 days, which was facilitated by my insurance Midway. I paid a refundable deposit of R2000 on condition that i must return their car without scratches, washed and with a full tank all of which i did. I have been requesting my refund since i returned their car 8 days ago through my insurance. To date they have not refunded me as they send me from pillar to post. They services is sucks. I must cancel a car hirer with my insurance since this means that in future i will still be subjected to the same treatment.