Subscriptions popping up all over the place

I have various different data contracts with Telkom Mobile. I started noticing the monthly bill for *** fluctuating and when I queried it I was told there was subscriptions and airtime transfers and the work going on with the number. I accepted that because I had given the SIM to a family member to use and it’s possible they were subscribing to things. I had to make several calls requesting that the subscriptions be cancelled and blocked on my line and each consultant would tell me it’s cancelled but it would just happen again until I eventually cancelled the line altogether.

Now that that line is cancelled all of a sudden my bill for *** is slightly more than the normal monthly contract fee. I called them and was told there was a subscription. Funny, because this is the line only I use and I never subscribe to things. Nonetheless they said it was cancelled today, but based off my past experience with these "subscriptions" I am pre-empting that it’s gonna be another back and forth song and dance with them with unsolicited subscriptions.

So I’m asking, from the bottom of my heart Telkom, completely block my number from subscribing to things because I will gladly cancel this line and every other line after that if this issue persists. I get nervous when my monthly bills are not constant because I don’t have open lines and so I need reassurance that I will pay only what my contract stipulates.