Handing over of accounts without notification

According to "BLAKE AND ASSOCIATES' Telkom handed over my account. I have no notification from Telkom about this. Now these B&A clowns keep harassing me about an 'overdue' Telkom account that was handed over. This after explaining numerous times that the account is paid and the call centre agent saying they would 'make a note'. The account is not overdue, the only outstanding amount is this month's invoice which is only due for payment next week. The amount B&A claim is overdue was settled weeks ago using the Telkom online paying facility directly. Nowhere on the account did it say anything about it being handed over and the payment was made directly to the supplier. Now B&A want a proof of payment. No, I'm not wasting my time sorting out the shocking mismanagement of accounts between TELKOM and B&A - you sort it out!!. I refuse to deal with 3rd parties that have no authority as far as I'm concerned. It is shocking that Telkom never advised me as a customer that I was handed over, without so much as a phonecall etc. I can't wait to cancel my line and just go completely mobile with another provider.