Avis is going downhill fast!

I have a corporate account with Avis and have been a loyal customer for over 20 years Now on 3 occasions in just four months I have been left astounded by their shocking service In October i hired a minivan from PE and after the hire received a "no show" fee. I had to prove to THEM that I did indeed collect and drive a vehicle and that I was NOT a "no show" How did I have to prove I drove a car? I sent them a picture I took on holiday with the vehicle in the background. What followed was I received a new (obviously much higher) invoice...but No apology and NO thank you and I had to now BEG and plead to have the 'no show' invoice reversed!!! Why did I bother! Then again in PE, I collect a vehicle and a approx 3km from the airport I notice the tank is less than half full. I immediately return to the airport and demand they sort the problem out. They do this by allocating me a new vehicle in the car park without anyone checking the vehicle properly, AND THEN CHARGE ME FOR "DAMAGES" to this vehicle when I return it! And now last week I hire a minivan in CT. The agent indicates to me that both the left rims hubs are damages and scratched. When I return the vehicle, they CHARGE me for the two damaged hubs! I am losing it with Avis! Has anyone got advise and experience on which car rental company is getting this right? I would like to close my account with Avis but need a recommendation on who to change to...