persistent calls

I am a rather satisfied Nedbank client. Not so long ago I had an unpleasant experience wherein an ************ Nedbank call centre agent sold me a credit card I didn't ask for. Hence I requested that I receive NO telephone marketing from Nedbank as the phone agents are dishonest and *********. Yet I still get bombarded with calls from the call centre. The very same call centre that provided ZERO assistance when I recently called with an urgent query. . They have only a sales focus - and zero interest in providing service and help - push you from pillar to post, if youre not making a purchase.