Unwanted marketing messages

I have been receiving marketing messages from MTN non-stop for the last few days. Double you bundle. Whatsapp bundles etc. I have tried to stop these messages without any success.

I have spoken to the MTN call on Sunday, 10 March and the lady assured me that I have been removed from all lists to receive messages. After all of this I am still receiving these messages.

MTN is ignoring my numerous requests not to receive these messages!!