MTN 121 AD MESSAGES!!!

I have tried numerous times to unsubscribe from receiving MTN121 Ad messages. I have contacted MTN customer care, which they confirmed several times I am not subscribed to any marketing. I have been in contact with MTN on Facebook, send them the screenshots to prove that I also downloaded the app to make sure I am not subscribed. They have "refreshed" my number on the system twice, and still cant I try to opt out using *135# as I receive an error when I want to choose "change content settings". Yesterday when I phoned again, I was informed that they will escalate this to the technical department. I don't want to receive messages every time I get a "please call me". It is so irritating and frustrates me a lot. I do not want to transform my body, or get callertunez or join fantasy rugby. Give us clients the option to CHOOSE whether we want to receive ads or not. And if we DONT WANT TO - STOP SENDING THESE MESSAGES