No MTN Service

Hi, since the 23rd of October I have lost my signal with mtn. I am unable to use my phone to make any calls or receive any sms's. I have called the call centre on numerous times and they keep resetting my number, then it works for 10 mins and then it's the same again. I have wifi at home and the only thing I can do on my number is receive whatsapp msgs and whatsapp calls. The moment I leave my house I might aswell leave my phone here because the phone is absolutely useless. I have inserted my sim into my son's phone and again no network. My husband is also with mtn, he has no issues. I have recently spoken to Mpho who advised me to remove my sim and wipe it of dust and insert it again and to switch my phone off for 5mins. AGAIN it worked for 10 mins and then the signal dissapeared again. You may check my number ***, you cannot even call me thats how useless my number is with mtn. I was supposed to receive a call back from Mpho on the same day at 3 even gave my work cell number but up till today I got nothing. I want to know how does MTN expect me to pay and continue the rest of my contract if I have had no network coverage for almost a month. This is absolutely rediculous to say the least. If I leave my home and I have to call someone I cannot and anything can happen on the road hence why people have cellphones but not me. I have to pray that I don't need it because of my useless network. I am irrate to say the least and deeply dissapointed in MTN. Please check how many phone calls I have made. I even called the network coverage cell number. That was too was just a dead end. So again, nobody at MTN is able to assist me and I now sit with a phone and a number I have had for years and now unable to use and yet mtn is expecting me to pay them every month for services I do not receive. I have never defaulted on my account and yet nobody can help me. I am so frustrated it's unbelievable. If I cannot use my number, then I expect MTN to release me of my contract so that I may port over to another network because this is absolutely unheard of and ridiculous. Please call me urgently on ***.