Overcharged

I booked a car through [URL Removed] with Europcar and was supposed to pick the car up on the 27/06/2015.We changed the booking to 29/06/2015 which they changed. The lady confirmed the new tariff as going to be around 217Euro.<br> <br> I picked up the car in Faro on the 29th as arranged and then were asked to sign the agreement after I presented the voucher [URL Removed] asked me to do. On the agreement I later discovered that the lady that I dealt with, added the CDW cover which I did not ask for because Holidaycars already had a NoRIsk Warranty issued. I presented this form after the lady offered me a Mercedes Benz as an alternative for the rental period and had to ask her twice to go back to the original document that I signed with [URL Removed]<br> <br> After realizing that the rental agreement I signed was wrong I phoned them and they informed me I should take it up with the people in Lisbon when I dropped off the car. They did not help at all - just said I should write an email. Up to now I have written them three emails and they said there is nothing wrong on their side and they will not refund me. I feel this is not the way to treat customers and visitors to Portugal