Telkom you keep surprising me with incompetence

Telkom, all my accounts have been paid up - this has been confirmed by your call centre. All accounts paid up since April 2015. Yet, you debited my account through NuDebt - Confirmed by FNB that it was you. You did this in July, August and September. I am listed with NuDebt, sending me constant messages that I need to pay R1500 to them. I requested a simple letter from your call centre 11 days ago Case # ***6 to proof to NuDebt that I have no more debt - something that is not my problem - why are you debiting my account if I am a paid up customer and then listing me with debt! I have been on hold with your call centre, after stating my case number to the call centre consultant for the past 19 minutes - and I am still on hold! I can not believe how absolutely pathetic Telkom is! Seriously pathetic. Send me the letter now so that I can have Telkom out of my life for once and for all and sort out your incompetence!