Account paid up yet not reflecting as so and my credit record is being affected!

Good day, due to due losing my job and being unemployed for 6 months, I was unable to pay my accounts and when I could pay it was below the installment amount. The account was handed over to Hammond Pole Attorneys. In September I was called (which happened and still is happening, quite frequently that it was borderline stalking) I requested the settlement amount, I was owing R8 363,18, settlement amount was R9,008.04. I paid this full amount the same morning, emailed proof of payment and requested a confirmation that all is in order and that this account is closed! Well now, a month later and I still haven't received this letter, I still received an email advising I am in breach of my agreement and legal action will be taken against me and when calling the guy I spoke to at Hammond Pole (Bonisanani Khumbuza) I was treated like a ******** and the phone was put down in my ear! I did a credit check yesterday and this account is still open and it reflects that I am not paying it, what the hell is going on with such a big popular bank and attorney company not getting their **** together, not updating your systems and harassing the public for money they have already paid! You are ruining my future and I am going to take legal action against both companies!