MTN Always *****ing airtime by registering u from unknown service

Im feeling fed up by MTn *****ing my airtime I have 3 sim card on contract + 1 normal sim card. The last time you guys made me pay 6k for bundles I didn't even use. Still I rrnew my contrat..Now my second sim that end by 0808 and my normal sim card are always registered to service that must cut R10 even R20 per days. not even 1 service sometime 5 to 6 that I dont even know. I loose more than R250 already I phoned to complain more than 3 times some don't know or cant desactivated from their system other gave me the *141*5# to desactivate Another one desactibated it from his system. But funny enough it reativate automatically every week or day im tired of loosing airtime in something I don't even know. I wont be able to pay for my contract and pay for something unuse airtime. Coz u r *****ing the contract money already I want it to stop coz is no more a mistake is generate from your side. I need a proper explanation