No Network coverage

The worst decision I ever made was to choose MTN as my service provider. I have had no internet coverage on the Network for the past 3 days. When enquiring today, I was told that I have no data. I had 30gig free data from MTN that expired on 08/04/2016. Now I would love to know what happened to the 500mb that I paid for? I have wifi at home and use it most of the time. In addition to this, my data was supposed to be renewed on 14/04/2016 - which is today!!! Why must I phone to get what I have paid for? In addition to this, I am still waiting for the statement / invoice which I requested on Monday 4 April that was going to be e-mailed to me immediately. Please step up your service, I am stuck with MTN for the next 2 years. I sincerely hope that the only way that MTN will react to anything is not going to be through social media for the next 2 years.