ER Consulting Inc. Is the worst to have to deal with

I was admitted at Netcare Greenacres last year in Dec. The consultation was handled by ER Consulting and it has been a nightmare having to deal with them. My Medical Aid made a payment to them as per their claim statement but its been 3 months where I waited for confirmation or statement which illustrates that the payment has been made. Instead they have handed my ID and details over to debt collectors which contact me on a daily basis and harass me with regards to payment which was paid months ago. They never respond to emails and their contact number either doesn't go through when you call or once you reach them it disconnects. This is merely unprofessional of them for such a big company and I am no happy at all.