NO CONTACT - NO CLUE

I received a statement from ER Consulting and requested to pay it. I then made payment, only to find out a few days later that medical aid had settled the bill. I emailed ER COnculting about my refund, and was advised I will be contacted and refund documents will be sent to me. This was over a week ago. I have tried to call the call centre, but they either cut the call or never answer. i tried emailing and still there is no further response. I cant believe this is the type of company a huge hospital associates itself with.