Jet is robbing me money for a subscription I never signed for!

Jet doesn't respect me as their customer. I have been contacting them, asking that they cancel the 'mobile subscription' on my account with no luck, this has been going on for years and I go to their shops they call the customer service in which I'm made to hold on the phone forever. Now instead of removing the subscription they added another. I hate this because I still want to keep the account but how do I do that when they are robbing me? I've never signed up any subscription, I don't even receive anything from them on that so called subscription. So clearly someone is benefiting on my account and no one from Jet wants to fix it.