BAD SERVICE - REFUND DELAY

I had cancelled my booking prior to lock down in March with no penalty applicable. I understand that no one was allowed to work for a certain period of time, but enough is enough! I have been in contact with Avis since end of April on my refund. Every time I'm being told that me refund was paid, I must wait 15 days and check my account. This is the same story every 15 days and yet NO REFUND. Now I'm being told that the query has been sent to Budapest or investigations!!! I will take this to the highest level and do what is needed.