Thought I'd get more exposure in chat than in holiday so here goes.
We travel regularly to Denmark to visit DHs family and always pick up a car hire at CPH airport. Have done this for 20 years and have never taken out their excess insurance as we buy our own each year.
When we came home this year we had been charged for their excess insurance...it's something like £25 per day.
I called their customer service here and was told to send through a copy of our insurance so the manager could check. (This is actually irrelevant as you don't have to have excess insurance) I did send it as requested.
I never heard back from them.
I called again and had a really rude woman telling me my husband had signed the contract (you know when you are standing at the airport desk and the clerk says "this is all we have agreed" and you sign)
She basically wasn't interested.
So...I sent a signed for letter to the General Manager, Alan Oliver-Smith at Avis Budget House, Bracknell.
It was signed for and he has ignored me.
We'll never use their service again but do be warned and take time to check the screen very carefully. It will take time and there may be a queue behind you!