Disappointed and feel **********

Very disappointed and feel completely **********. Up to now I have used Enterprise many times and been happy but after this time will never use them again. I booked a car online for one day (a Tuesday) using my debit card. Never got a email confirmation. Did receive a phonecall saying they dont accept debit cards and that I would have to pay by credit card when I collected the car. I then had change of plan and needed the car the previous Saturday. I phoned the branch on Saturday morning and they said they could help me and I went in to the depot. They were very helpful and offered me an upgrade at no cost as a car had just been returned, and as they do not open on a Sunday and I would only be able to return the car on the Monday said they would only charge me for 1 days hire. Sounded wonderful. Paid for the 1 day hire and deposit on my credit card. All went well and returned the car on Monday. BUT - Actually they DID take the money paid on the debit card (1 days hire) as well as the 1 days hire fee I paid on the day. So basically they went completely back on their promises! I phoned in to complain and they said that they had never promised me a free upgrade or that they would not charge me for the Sunday when I could not return the car and that they were not in the business of giving out free cars. It is not about the money. Just why promise people things you have no intention of honouring.