********** transaction on MTN account

I have received 2 sms on my LTE router data only package stating the following,

" thank you for subscribing to MTN gamer+Mofun at R4/day or a lessor amount. 1st day is free. visit now http://bit.ly/2fh8v0j. you have 3 free draws. redeem them at *156*8# or www.luckydraw.net.za. To cancel dial *155#. Ts&Cs www.mtn.co.za"

I cannot dial that number as the sim card is in my ZTE router and i have a vodacom phone. I have escelated this matter internally in MTN however i keep getting told to dial that number. How do you expect me to dial that number on a vodacom network? Please inform me of the IMEI number which signed up for this account and block all subscriptions. Please revert with feedback.