Billed for content charges

Made over 20 calls, requesting charges to be reversed for services never requested or subscribed for. Reversal of charges refused. Subscriptions cancelled by consultant but keep coming back using up all airtime resulting in not being able to make calls. When requested contact information on service providers that are billing Mtn, telephone numbers provided found not to exist. Unable to use my phone, consultants unable to resolve problem. Several times left messages for some senior person to call me, never can get one when you call, you get no response.