CONTINUED NON-WORKING OF MY MTN LINE!!! 3 WEEKS NOW!!!!

I have received absolutely no replies to any of my request to sort out my MTN line (connectivity or whatever it may be called - referring to both data and phone calls) that is not working and have spoken to everyone I can speak to since mid-December. I no require the contact details for the Ombudsman that should be contacted because I cannot carry on like this. Your own store tells me to get another sim card for another service provider to use until the problem is resolved???? Please supply me with the details