they double billed me for my room . booked 3 rooms...

they double billed me for my room . booked 3 rooms. told them 3 or 4 times to make sure to charge the other people for the 2 other rooms they said ok , told them i'm only paying for one room . they didn't. then it shows up on my credit card. ask them to take it off they say they can't. won't stay there again!!!!