Stop harassing me (30574, 30177, 47940, 34471, 32271)

MTN keep on sending me SMSes iro competitions and life tips etc. I cancelled all subscriptions with them but they still send me SMSes from 30574, 30177, 47940, 34471, 32271. This is super frustrating. I do not want to be subscribed to ANY service or subscription or life/health/fitness tip etc