MTN does not keep their promises

I would like to make a complaint against MTN. The last time I made a complaint was on the 5th of March. I was promised feedback.It is now the 3rd of July nearly 4 months later I still have no feedback. I am still waiting for a response from MTN regarding 100MB data a month for 12 month that I was supposed to receive with my purchase of an Alcatel Pixi 2 smart phone (pre-paid). I am tired of having to write complaints because service providers like MTN do not give customers what they promise. This just proves to me that MTN's word holds little water and is just another example in this country of the customer being ignored.