Extremely disappointed with discovery and avis

I recently had a claim with discovery and used the car hire services through Avis. I am extremely disappointing in the service received when trying to arrange to have the rental returned. I was advised by Avis that i need to contact my insurance company and have them arrange for the car to be collected. Repairs on my car was completer on 30/10/2019 and I called the claims consultant where he was not available and then was advised by another agent that they will get him to call back. I tried on several occasions to have someone give me a call back, with no luck. It seems like the agents are only willing to assist when it comes to logging a claim and then they just do not care. I eventually managed to get the car collected by Avis. when the rental was initially delivered the date of return that was entered was 19/11/2019, now I receive a bill for going over the rental days I am very disappointed in the service received. I regret leaving Outsurance as they were always on the ball and always followed up with there clients. Will not recommend discovery insure to anyone!!!!