IM NOT YOUR CUSTOMER

For the past 3 months, I have been harassed daily by Nedbank. I have never been a Nedbank customer and based on their incompetence in removing my number, which is seemingly linked to their customer, has been such an issue. How can we get this right? my next move is to take them to consumer protection cause I genuinely cannot keep asking for my number, a number that Ive had for 10 years, to be removed from Mr Gotsanans account