Disgusting service overall

From October 2024 till today I'm still struggling to get my full refund. I was refunded a short amount & when I enquired they said they charged me for petrol whereas I filled the car. Immediately they miraculously find the receipts that shows that I filled the tank & was promised the outstanding amount will be paid out by the 31st Jan... Till today. I'm constantly asked for bank statements as if I get those bank statements for free... Avis is such a *****ster company. I've used other rental companies and it's my 1st time ever struggling like this to get what's due to me. Disgusting customer service as well.