Paid up account being billed

I ********** -5

I settled all my vodacom accounts in June 2016. In July of this year suddenly Vodacom started deducting from my account again. I phoned them and they told me they allocated the settlement money towards the contract premiums. They asked me to send them the prrof of payment and settlement quotes from last year which corrsponded. I did that and received no response. A week after I followed up with no response or feedback. Two weeks after that they threatened me with legal action for R1000 outstanding monies (which I stopped at the bank). They said they cannot do anything I must sort it out with the retentions dept. I told them I already did that with no response.

I have sent the settlement quotes and proof of payment to various people at vodacom and they ignore me. I reached an agreement with them in 2016 and fulfilled my contractual obligations. They keep ignoring my requests, do not give me any feedback, and keep threatening me with outstanding payment litigation and blacklisting.

How can it be so difficult to sort out something so simple?