Must we just Bow down to them?

In Oct I received SMS that they are cancelling MY LIMIT facility and I must call to make arrangement.After a telephone call to them I realized something is not right. After investigation on my account I found that I was billed R2952.84 on a 2gig data contract instead of R150 pm with a MY LIMIT protection that the have been charging me since inception to protect me not overspending.Now suddenly this protection is not for data contracts, but for voice contracts How can the sell something to me that do not work.Now after my complain the changed my contract to a top up without my consent.I am still waiting since Oct 2015 for someone to call me back and inform me what the cost will be as I am still under contract.And to resolve my query about the ******** billing.The operator said to me they found that MY LIMIT do no work that well on DATA CONTRACT.Who's fault is that after the where prepared to take my money for a service that do not work.Tried to call them,but you get lost in there phone system and people that cannot give you answers.by stalling me,hoping the problem goes away.