Call centre harassment

I have 2 personal loan accounts at Nedbank but I'm currently under debt mediation. I've had numerous calls from Nedbank's calll centre and told them every time that I'm under debt mediation since March last year already. My debt mediation has also sent their legal department emails regarding the situation but nothing changes and I keep getting threats. This is totally unacceptable. Can someone please help!<br> <br> Agent name : Angelique Smuts <br> Email address: [Email Removed]<br> Tel number : ***