No feedback in almost 1 month!

I have been phoning MTN from April to complain that my voicemail automatically changed to voicemail lite which is an inconvenience due to the fact that i am unavailable on my cellphone most of the day and rely on the voicemails to return calls. Everytime I phone the operator would tell me that they have reset the settings and that I should turn my phone off for five minutes and when I turn it on it should work. After a couple of similar calls I finally logged a complaint on this obvious techinical error as their system says I am now on voicemail but when you dail my number you still get the \ welcome to the voicemail lite service of...."message. I phoned in over 3 times during the course of May requesting feedback to which they answer that my fault is still open and no-one has given feedback on the matter"