Subscriptions on my phone

On the 16th December 2017 at around 6:30 in the morning I bought airtime for my phone. On the 17th at about 5:00 in the I received an SMS that I have subscribed to UKIDSTV, I opted out and send them an SMS and they kept on thaking my airtime. I phoned MTN Sunday morning informing me that I am loosing airtime due to the subscription that I do not know or subscriped to and they said they are cancelling the subscription. Few minutes later the airtime kept on going. Sunday morning I went to MTN and they couldnt assist me. I called them again the 18th in the morning and they told me there are other subscriptions included the UKIDSTV which they said they have cancelled. They informed that they are cancelling it again which is the second time now that it is cancelled. They also informed me that there is another subcription emobile and demo plus, those that I am not aware of. All I want is for MTN to return my airtime of atleast R100 that I have lost. I have never subscribed to those companies.