Opted out, yet still receiving marketing messages

I am opted out of all marketing consent, yet, I'm still receiving marketing messages. Also, in the marketing messages it says to dial *135# to opt out. I( have been opted out for months), but, in your online terms and conditions it states the following: "6.3 On each SMS the customer receives, will have the option to Opt-out by dialling *141*5# USSD string with a clear menu providing the option to Opt-out of MTN Mobile Advertising or respond via SMS to 30212 to STOP receiving messages." There is nothing related to consent management when dialing *141*5#