Planet Fitness is the worse

I canceld my contract after they placed me on month to month. (September22) I gave my notice and they asked me to stay another month at 50%. One month later they deducted the full amount and when they tried to deduct January again i phoned to ask why cause I do kot have a contract with them anymore. They said i have to give another months notice and still pay January and the notice month. This is now a total of R2100 they are exporting me for. I canceld inside the gym and over the phone. Sent numerous emails but they still want me to givw notice Again! *****s!