BAD SERVICE

Downloaded an MTN WhatToVue Application, registered fine and everything worked well. After a few months on the service my device could not log in anymore. I called the call askinf for assistance where I was told I have to clear the cache and clear the data under my phones settings and switch off my phone, I did that but when I tried logging in on the application I could not log in again. I called the technical support acll center again where I explained that I still could not loggin and asked the lady who was helping to put me through to the person who was helping me before..she looked for the the guy and told me that the two guys say that they do not remember me. I then requested that my Vue account should be disabled as I could not log in to a service I was paying for, I was then told that I have to unsubscribe from the service myself, but how do I do that if I can't log in....my airtime was about to finish and I asked the agent to call me back when he told me that he can't because another call will come in... MTN always has issues and they are taking our money for services we can't use and why do we need to pay for calls to a call centre when the calls should be free.