Terrible admin and collections agency

I been arrased by a collections agencies concerning an outstanding amount for the past few months, stating that my account is outstanding. I requested an statement as my son was involved in MVA in September last year and according to my records the medical aid paid it in full and i received NO account from ER 24. Only to find out it was an account for February 2018. I enquired with my medical aid about that specific incident and they also paid the account in full when ER sent it to them, even thou they only sent it in November simutainiously with the claim for September MVA. I then responded to the collections agency proving that my medical aid paid the full amount that ER claim in full they still insisting payment for an amount that no-one can give me proof for. If ER underclaim from my Medical aid that makes it an ER admin problem, that they obviously have for sending the claim 9 months later. Totally unexeptable. I see that there is more individuals with similar complaints.

ER I recommend that you first rectify your admin department before you hand people over to collection agencies, as the first time I became aware about any amounts outstanding is a year after the incident and not from you from a extremly rude collection agency stating that I used ER therefore I know that I must pay them.