Inefficient

I am still waiting on a letter from Nedbank with regard to the full payment of my Nedbank Credit Card debt with them. I paid an amount of R214.42 on the 24th February as I was advised by one of their agents that this was the full and final payment. I spoke to a manager/supervisor at EFG and confirmed that it was their error and will be sorted. To date I keep receiving calls from EFG Attorneys who are dealing with the account that I still owe +/- R100-00. When I explain they say it will be sorted and I will receive the letter. I am still waiting. They are extremely inefficient when in the wrong but quick to ask for payment. Please sort this out a.s.a.p. Their reference 5898460742492580