Marketing Spam

I receive a lot of spam sms's from mtn every single day. This is terribly annoying.<br> <br> I contacted the call centre (***) and was told that the marketing messages are sent automatically and there is nothing they can really do about it. She will however forward my number to the team leader and ask him to try but that they will probably not be able to stop the messages.<br> <br> This is unacceptable! I should have the option and be able to stop marketing messages sent to me by MTN.