Unauthorised subscriptions/ Content Services

I’m extremely annoyed with Cell C because I have a data contract with them and it’s been years but today I was surprised to see my monthly contract amount increased, when I called in to enquire I was told that it’s because of content services and I was given a number (14788) to send a message to. The message being “Stop match me” when I told the agent that the sim was in a router, she asked me to remove the sim out of the router and insert it into a phone to send the message, after multi attempts of sending the message as per instruction- I received “send failed”. I called in again and informed them that I couldn’t send a message through the number in question but I was informed that the number should be able to send the message or alternatively I should send an email to: *** . This has just been a nightmare/headache which is totally unnecessary because I’ve never authorised any subscriptions of this nature. Cell C please do better in protecting your consumers from this *****.