DISSAPPEARING AIRTIME AND BAD CUSTOMER SERVICE

So I buy airtime and data and my airtime disappears without me even making a phone call. I'm not subscribed to any content services or anything. I called MTN to confirm whether there is any subscriptions they can see on their side. They confirmed that there wasn't. So I asked what has been depleting my data I was told it's something called \Accumulative 5". . It's an MTN service where they subscribed me without my permission and apparently they cannot unsubscribe me. They are literally *****ING mt airtime because that's what you call it when someone takes something without your permission! I have 3 top up lines with MTN and I am seriously considering taking a contract buy out from another network!!!!!"""