no response to complaints

I logged a complaint via the customer services email address. I got an automated response that I would be contacted. 2 months later i receive the first response only to be told that someone else will contact me. it took another month and a half for someone to call. i was told that a technician will contact me but no one did. The cell reception in the area is terrible yet was not always the case. even in ares where reception is good calls just drop and a message call failed comes up. I explained it has done it with 3 different phones so it is not the phone. Today i have no reception, then i will get 1 bar then no reception again. I am in the centre of white river in a busy town this is not acceptable. MTN just takes your monies every month and don't spend nearly enough time taking care of their customers. I have been a loyal customer for over 12 years and have never even got a thank you from them. My account averages R1500 every month, so they need to sort this issue out or i will move to a different mobile service provider