Unhappy about dstv service

Good day

I upgraded from Compact to Compact Plus in June/July-August. I recently got a statement that reflected an amount that is not for Compact Plus.When I called the call centre I was told different versions.One agent says I actually called in to upgrade which I have never did. The other agent said that I upgraded to the dstv premium through self service which is not true on the 31 July 2019 and the other said on the 31 August 2019. My 10 year old son sometimes uses my phone for school homeworks and if he accidentally upgraded my package then multichoice self service is not as secure as it should be, as I never received an sms or email advising the upgrade. I now have to pay an extra R250 which I know nothing about. Nobody is willing to help, I refuse to pay extra amount that I know nothing about. This is stressing for someone in my condition as i am pregnant and do not need this stress. Can I ask that this is sorted out as soon as possible. All I want is to pay R519 for my DSTV Compact plus package that I was originally on.