Economy Rent a Car

I reserved a mid-sized SUV car for one day (Montreal, QC, Canada, Airport location, July 30- July 31) through Priceline and my reservation clearly said, unlimited milaage (KMs). When I went to pick up the car, the executives were very rude, I waited for 2 hours, and the worst is I was said, the maximum I can use is 200Kms per day. If I don't agree, they threatened to cancel my reservation. Similar, things happened to other customers there and most of them were very frustrated. After returning the car, they tried to overcharge me and only after a very heated discussion that they finally agreed to charge me as per my reservation. The worst is, after a few days, they now processed an unauthorized payment of $1, 058 on my credit card for no reason. Now I am trying to call them multiple times and they are saying they are too busy to take care of this. This is a clear case of customer harassment and cheating for now reason and I am sure the other customers who rented the cars on the same day would have similar story to share.