Dealing with Mtn Is Very Tiring

I have been an Mtn client for the over 11 years and been using their insurance as well but whenever I must claim there is always a story, I send the claim forms 3 weeks ago and been calling them to follow up on the claim but it seems like no one knows what they doing there they always promise to call me but no one ever bothers to do that, my cell phone is chattered and I cannot even use it in short I don't have a phone to do their job which is to do the follow ups. I need the manager or supervisor to call me and tell me when is my phone going to be repaired. dealing with Mtn is very tiring. I need a phone as soon as possible because I am paying insurance and my phone monthly .thank you