Unauthorised welcome tone advert

I have had many clients and family call me and tell me that there's a welcome tone service on my number. I have not subscribed to this, ever. I've tried dialing a the numbers to unsubscribe and it doesn't work. Then I get on the phone with vodacom for them to tell me to do the exact same thing I just did and then they say they can't help me. This needs to be removed from my number ASAP. I did not give vodacom permission to solicit my personal info.