Recharge MTN141 & Daily MTN Yello Spam SMS

Every time I recharge airtime/bundles I get at-least 3 marketing sms's and this is really annoying. I tried calling your call centre to stop this service and the lady told me that it is impossible. Please remove me from your marketing databases. And also please stop sending me daily MTN Yello sms correspondence.<br> <br> A notification sms that my account has been recharged is all I need. Not the other spam marketing sms's