Raising of gym payment without warning

<p>I had a contract at planet fitness and as im on vitality i was only supposed to pay R160 per month. all of a sudden this month i get a R320 bill. I call PF to enquire and they told me because I am not a frequent gym goer (Yes Im that person paying for a gym i hardly use) Discovery INSTRUCTED them to charge me more. Who gave Vitality this authority. I didnt sign up for that condition. Anyway, cancelled that contract and my next move is cancelling Vitality. Only reason im with Discovery is because its through my company.</p>