hotel.com for canadian residents Internet

hello, canada.....I live in calgary alberta canada. I was going to visit my mother- in- law who living in ottawa canada. she is 96 years old and living  in the old age home ..so me and my husband need to stay  hotel near by...I typed  the hotel name and then  1.800. phone number showed up... so l called them up and make the resvation for few days.. when l  get the credit card statement ,hotel.com charged us $ and coverted to canadian $....when l maked  the resvation that l though it  was the hotel anwsed... NO IT WAS HOTEL .COM ....from calgary to ottaw, from canada to canada  that l payed US dollars.. l just  couldn't belived..SO,  PLEASE canadian ,don't use hotel .com if you travel in canada... thank you for ripoff report .