No follow up on poor reception

What purpose on earth does mtn's customer service have ? A while back I placed a complaint only to receive all talk and no action. My reception is still poor in Brackendowns and data is mainly used away from home as it is very unreliable. I am appalled that even after a customer compliant there is still a lack of energy in attending to problems. Quality system failure is my opinion. Passing the buck from one useless department to another. Does the ceo know exactly how *********** the staff are in attending to a customer complaint with at least a progress report?