Highly disappinted in Avis' return process/policies

I have been incredibly disappointed with the service I am getting from Avis regarding the process of returning their vehicle. Firstly, the process for returning the car took so long (almost 30min) that I nearly missed the deadline. And then, when it comes to paying back my refund, it has been like pulling teeth. Twice I have callled and twice I have been told that an email is being sent and that the refund is being processed. It has been 2 weeks now! Would not recommend at all if you're looking for speedy and efficient service.