Avis Car rental is a Disgrace!!!!

Never never never use Avis!!!!! The worst service you will get if you need admin support!!!! The worst service I have ever received, I rented a vehicle for months, after the return and contact completion they claim to not be able to find proof that I paid a deposit and therefore won’t refund my funds, this after I offered to supply them my bank statements and also contractual evidence showing I paid a deposit they still claim to not be aware of any payment. Secondly after several calls of over 30 min each they kept me waiting to only say they will investigate, till today I have not been helped and still haven’t been contacted back, this is 3 weeks since the contract ended, I will continue to fight Avis and try reach out to higher management to get this issue resolved although every time I call I must start the whole process over by explaining to new agents what’s the issue and do the 30 min waiting on a call for someone to eventually explain they will investigate and get back to me.