MTN's ******* pop up ads

Wow you guys are working on my nerves. I keep receiving pop up adds on my contract device which I have tried to "opt out" of every time. Each time I've gone through all the menu options on the *155# code that's is listed as the opt out option, but it never stops. Isn't it ******* to not give a correct opt out option? Been with MTN since 2007. I may just end that business relationship that involves several devices if this cannot be stopped. Absolutely pathetic from MTN, and it seems to be an inherent problem