Worst customer service

I was admitted to Glynnwood on 21 January for a procedure. They insisted that I pay a co-payment, which according to Discovery should not be the normal process. Then at the same time on 24 January they submitted the FULL claim including the co- payment which was settled to them on 27 January. Which means they have been over paid for this account.After several calls they informed me that I need to complete a refund form.Which was completed 4 February. I have still not received my money.It is now 3 weeks since I had to make this payment. I am not sure who will be settle the interest.