Judgement placed on my name

I took out a loan with Standard bank on the 14th October 2011 and settled it the very same month(27/10/2011). Only to my surprize I recieved a call in July 2015 from DMC that my loan was handed over to them due to me being in arrears. I contacted DMC and informed them that the loan was settled in 2011, they requested the proof which I forwarded to them. They advised me the waiting period for feedback regarding the query is 5 working days. up until today I have recieved no feedback. I contacted STANDARD BANK call centre last week, Ive spoken to Chester he advised me that his team leader Boitumelo Gaokegse will get back to me with feedback, I am still waiting. This is completely unacceptable. Its a waist of my time and money. I now have a judgement on my name for a loan I settled. Giving me a bad credit rating. due to your guys incompentency , I am now unable to apply for a home loan. Is STANDARD BANK going to provide me with a place to stay? I think not. Please resolve this ASAP and have my name cleared as Im on the verge of taking the matter further to the Ombudsmans.