Mtn *****ing customer airtime

I am utterly disgusted with MTNs bad customer service. Firstly, all my airtime and data was depleted a few days after recieving my monthly airtime and data set which of i only made one phone call.After that my airtime was missing. This is not the first time my airtime has been taken and i know SEVERAL people who have experienced the same problem. Nothing else could be taking my airtime so there is no alternative!<br> Secondly i receive daily Yello mesages which are unnecessary and no other networks bombards me with spam messages.<br> I am going to change my network an will encourage others to do the same !!!<br> Please reply as soon as possible because I will definitely take this further. <br> <br> The statement given on phones setting changed and updates taking my airtime is rediculous because my updates only installs via Wifi and my settings never chaned at all. I will not accept these week defence apologies!