Billing Account balance not going down

I have an Edgars account which hasn't been paid for the past 3 years, Edgars decided to sell their book to Munnik Basson DaGama Inc to collect on my account, I had an insurance on this account, however to my surprise when I lost the Job back in 2012 I went to the branch to claim for the insurance to pay my account, and same was not done until I received a call from the attorneys advising me that my balance is R10000.00, I paid in an amount last Month of R500 and this month I paid in an amount of R2500, I am on a contract and I am trying to pay this account while I still have a job but the balance is not going down it I dramatically climbing to a higher stage which I cannot be able to afford, all I am asking for is for some of the charges to be written off and the acc be withdrawn from the attorneys so that I can pay Edgars directly, an amendment in the NCA has been made regarding this accounts older than 3 month