MTN Worst Services ever from Service Provider

Since my upgrade at the end of Dec 2014 I have experience numerous problems with MTN. I have tried to sort it via the Call Centre, going to a branch, Logged a Complaint ref *** on 24 Feb 15 with NO RESPONSE after which I logged a Complaint on HELLOPETER dd 3/3/14 . Finally received a response from Coverage Contact Centre Ref ***. I rep**** on the mail on 19/3/14 for an update but again NO RESPONSE. Yesterday 31/3 tried to make call - reply: I had insufficient airtime & should load airtime, even though I received data & airtime on 27/3 BAL 121.54 ANYTIME MIN 394 SMS 761.39 MB DATA. When I check availability on *141# I then tried to call the contact centre at 16:46 on 808 & tried more than 13 times to sort out the problem. Last time I tried was 18:05 when my battery ran out. The line was dropped every time after a few minutes. I tried the 808 again this morning without success.I have been with MTN for more than 10 years, always paid my account on time. I HAVE NOW HAD IT WITH MTN! I DO NOT WANT TO CONTINUE DOING BUSINESS with them any more. I will tell as many people as I can about the COMPLETE LACK OF SERVICE FROM MTN & ADVISE THEM NOT TO MAKE USE OF THEIR SERVICE