mtn charging me for things i dont have

after all my phone calls and complains i have put with MTn to avoid this situation they now send me a bill for something i do not have. no one at MTN knows what they doing. they make promises to call they clients back but they dont they call centre managers dont do they work and make sure clients get contacted when there is a problem. who is there for us to speak to when there is a problem. mtn says they the boza network but looks like in only bull****ting they clients