Tempting offers to minors

Hi. I upgraded my minor daughter's contract at a Kby store Aug 17. She had some month to month data purchases that she activated by mistake as she thought that it was a once off. I informed Kobus at the shop that a minor is using the phone and I requested the shop to remove these bundles. They did as i requested. I also put 2 GB data per month on the phone as this will be sufficient for a minor. This month i realised that all the extra bundles were activated again. Upon enquiry i was informed that they send my minor kid a sms asking if she would like the services activated again. As she is a kid she rep**** yes. Now mtn says the cannot refund my money as she had use of the services. Does this mean that mtn will send sms's to minor kids to try and tempt them to spend money on services. Please advise me if i cannot trust this service provider with my child. This seems to pose a risk to my child if this is the way mtn operates. Please advise ASAP as i want to take this up with relevant authorities. Thanks. I also requested Kobus to email me his supervisors contact details this morning but it is now 20:00 and i have not received the information i asked for. I also waited for a week to get this feedback.