confidential information divulged

I have been receiving SMS notifications for another ABSA client living in Cape town. It is an irritation to me and divulging confidential account information to someone other than the account holder. I have contacted ABSA contact centre on several occasions to remove my cell phone number from that person's profile. What a joke. They keep telling me that can't be done - only if the account holder phones in herself. Please can some useful person (as opposed to useless) contact me to sort this out. This has been going on for a few years now.