MTN customers subscribe to services without consent

MTN customers are subscribed to services without their consent or knowledge! I have been a MTN contract customer for a number of years and this is shocking..my bill has increased by over R200 for the second month..amazing how you can be advised when you out of your data,sms,airtime bundles but charges for services you did not subscribed too! This constitues *****! After contacting MTN vis Social media my subscriptions have been cancelled! When did i subscribe in the first place is my next question? How many other customers are you doing this to? I await answers!