Failure to finalize payment and close account

I had a credit card account with Nedbank (acc.no. ***) which due to non-payment was handed over to Norlam Attorneys for collection (Ref. No. NP092176). On the 19th August 2015 I settled the account with an amount of R11251.47.<br> I then sent via email the proof of payment to Norlam Attorneys- to be specific to Nokuthula Mhlali and ****ord Muse on the 19 August 2015 and requested a paid up letter. No written response was received then I had to follow up with a call and Ms Mhlali told me that the payment is not as yet reflecting on their records and as soon as it does she will forward it to Nedbank Head office so as to enable them to allocate the funds and close the account.<br> On the 31_08_2015 I received an email from Norlam Attorneys -Violet Masela as contact person - sending me the recon statement from Nedbank with a message requesting me to confirm the date in which I will make the payment. On the 02_09_2015 I forwarded her the proof of payment and til today she has never responded nor acknowledged receipt of email.<br> On 04_09_2015 I recieved an email from Karin -Norlam Attorneys threatening of legal action if I did not make the minimum payment of R1148.12 by 07_09_2015.