AVIS SERVICE STINKS

i was given a car by avis after i was involved in an accident since a had a curtesy car with discovery my insurance upon collecting the car at avis i was required to pay an amount of R2500 which was not a problem for me because those are the terms i am aware of and that it is a 30 day agreement ,i received an sms stating that the car needed to be returned on the 22/10/2023 which indeed i returned the car , on monday the 23/10/2023 i spoke to the urgent from avis notifying them that the car has been returned and she further send me the invoice with R2218.20 amount due refundable to me, i then ask them to process the payment and she also told me money will reflect in my account in 3 to 5 days , which they they never process the money , on monday the 30/10/2023 i called again for follow up they told me that it will be processed in the week not even specifying when ,i am so ****ed with avis , discovery will just have to watch it because the service avis is offering to their insurance holders will make them to loose their customer their service stinks , they are quick to charge large amounts of monies when the cars are returned but when its time for them to pack they have problems and mind you this is not the first time had treated me like this ,they are perthitic unrealiable people who think that they are the ones who knows money people out there when you take up insurance with discovery ,please do make certain sure which company is assisting them in terms of curtesy car information you dont wanna end up like me