NewDebt is Inefficient in Telkom Debt Recoveries

I want NuDebt debt collectors to stop contacting me about Benjamin's Telkom debt. They disclosed his name and the amount owed in a text message. I have asked them repeatedly to remove my number from their contact list, yet I still get calls and text messages under Benjamin's name. They have been harassing me for 6 months for this debt. They are inefficient at answering calls or messages.