Deposit dispute, I want my money!

Wish I could give a 0 star rating! My car was in an accident and the insurance referred me to Europcar for a rental, all went smooth I paid the deposit, took the car back in time, clean and full of petrol, receive my invoice, nothing wrong and was told the deposit will be refunded within 7-10 working days. 10 working days pass and no refund, followed up only to be told there’s a refund form I need to complete and email which I did and then I must wait another 10 working days. We are on day 9, I have been mailing, speaking to agents on whatsapp and no one can even confirm if the deposit was processed.

I don’t want much, just a date when I will be receiving my refund and then I actually want my refund!