Planet fitness potchefstroom deduct any amount as they pleases

They come with contract and promises i ask what happened if not there say can freeze it for 3 months and continue i write them mails i contact them with no repky/cer*****y its accepted to my surprice they take debit order today for 2 different amounts and also not amount that i sign up for so tell me how doed it hsppened? I think its not a way to do business if you sign up for something you expect it will be like that