Well I have started my chargeback, since I got this final answer from Avis:
We are sorry that we have not been able to solve this case in a for you satisfying way.
We have attached the relevant parts of the terms and conditions that you have signed as a preferred customer, page 7, section 10.
From Avis side we do think we have answered the questions to our best ability and consider this case to be closed.
Furher questions in this matter will therefore not be answered.
We regret this deeply and hope to have the opportunity to welcome you as customer some time in the future.
