MTN ignores my complaints

Someone is using my data bundle SIM card ( *** ) in my alarm system to send multiple SMS messages to 34471 which seems to be a MTN Game show (According to Google) As I tried to explain to customer services at MTN (808) 2 times as well as the Customer care centre in the Brooklyn Mall the SIM card is locked in a cupboard inside a Cell secure engine used for connecting my alarm system to my cell : *** as well *** (wife) and my Neighbours' cell. The numbers were programmed by Zela tech alarm systems years ago. Nobody has access to the alarm system but me. The SIM card has not been removed from the cell engine in the past 4 months for any reason.<br> I did not register for any content or special services on the number in question foe obvious reasons.<br> I complained on MTN`s website. I complained on their website where you report *****.<br> <br> Nobody seems interested to help me or knows what to do.<br> <br> Dates : 12 Jan 2015 - phoned 808 <br> 26 Jan 2015: - phoned 808<br> 26 Jan 2015 - Customer care Brooklyn Mall<br> 26 Jan 2015 - Complained online.<br> <br> For the period up to Dec 20 - R200 extra ( above the normal usage )<br> Up to Jan 20 - R400,00 extra.<br> <br> MTN is not helping.<br> Help!!!!!