Avis - Horrible Service and ignoring client messages

Case: emWT5U, *** I hired a car in August 2024 at the Kokstad branch; I never received a copy of the Rental Agreement, Invoice and the refund of the holding deposit after I returned the vehicle. I followed up again in September 2024 and was promised that they would look into it and get it resolved. Till today, I haven't heard from them. I need the refund of the holding deposit. After loading a complaint on this platform, they requested further information, which I provided on 18/02/2025. They acknowledged their error and said they will refund the amount. Up until now, I have not received any feedback after sending messages on this platform as well as emailing them.