MTNs theft of airtime

the mtn menu unlocks my phone and advertise monthly prescriptions tk thing you will never need. So my phone is in my pocket mtn unlocks my phone and opens a menu on the bottom left side of that menu there is a ok which describes you to there service which costs you R3 or day you have no idea why your airtime is vanishing. MYN is *****ing your airtime right out your poket with out your knowledge or consent they are very dishonest and deserve to be prosecuted for theft.