Avis not refunding my deposit

On April 2nd, I rented a vehicle through FNB with Avis and returned it on April 6th. Upon returning the car, I received an estimated charge document via email. After waiting a week with no sign of my deposit being refunded, I contacted Avis and was informed that my refund was one of the few affected by technical issues experienced between the end of March and the beginning of April.

This information was never proactively communicated to me—I only found out because I followed up myself. The lack of communication and poor service are unacceptable and have left me extremely dissatisfied. It has now been 10 days since the vehicle was returned, and I am still waiting for my refund.