Poor service

I have been complaining about my account (standard bank credit card) which was handed over to Nimble's collection since December and to date it has not been resolved. Last year November I had a balance of about R2900 which I queried and it was changed to R1800. I was then offered a 20% discount(R1150.00) to settle the account and couldn't afford at that time but continued with the arrangement of R350 every month.Now in February, my account has escalated to about R1900 whereas I don't have default payment since December 2016. I went to standard bank requesting the statement after I was advised by one consultant and it showed that I owe R807.00 as at 14/01/2016. I then phone Nimble's collection on Friday and again on Monday. I spoke to Zuraya who referred me to Carlyn. I never spoke to any of them as they were not ready to speak to me at that time thenNashiefa had to pick up my call while they were still arguing. On Tuesday I received a call from Nashline who promised to get back to me as the matter is now with the Ops manager. But till today I haven't received any correspondence and I want to settle this account as it affects my credit profile.