NuDebt Management is still harassing me - after they acknowledged receipt of payment from me

I posted a review on the 1st of November about why NuDebt management is allowed by the SABC to harass clients on "overdue" accounts which the SABC just handed over to them without informing the account holder that fees are due. I also complained about receiving another e-mail for payment of the exact same account from NuDebt, a few minutes after the account had been paid and acknowledgement of receipt of payment was made to me in writing by one of their agents.

Guess what?! This morning I received an sms threatening legal action against me if I do not pay the account.

Is there no-one who regulates these creeps? Do their managers encourage them to harass people who have paid? (I asked to speak to a manager and they just ignored my request.) It took 54 minutes of chatting online, providing the names of 7 of their employees who had been dealing with this account, sending them the acknowledgement of receipt of the payment from a "Business Accounts Collector", as well as the acknowledgement of receipt of payment from the SABC, for aforementioned "Business Accounts Collector" to finally call me.

That this level of incompetence and lack of administration is allowed, on top of the general attitude of the online chat agent to simply not answer a request they do not feel like answering is absolutely Disgusting. The managers' lack of interest in assisting their online chat agents is beyond infuriating - the service I received this morning is nothing short of pathetic.