Nedbank Harassment

I keep getting harrassed by Nedbank Credit Card division. I have stated NUMEROUS times that they have the incorrect number and I have no idea who the person is that they are looking for, yet they continue phoning me. I have had 4 phone calls in 3 days, with one being at 6.30pm. There is no way to speak to a senior person as they all state that they are working from home. This is really ridiculous and I am fed up!! Each time the consultant says they will remove my number from the database yet the next day I receive another phone call.