Supplier misleads customers

I bought a new sim an got the following sms when i put the sim in my phone ...... Welcome! Your number is ***. For a SIM Swap: Dial *173*3# or call 173. New SIMs: Recharge with R30 today and get R60 Airtime plus 100MB. TsCs. <br> I recharged with R30 and didnt receive the airtime or data promised. After numoures calls to the call centre they eventially told me to go to an mtn store but at the store they told me that its a promotional sms and mtn cant help me.