3 weeks to pay out a claim

I submitted a claim to Discovery for a payment that I made to a doctor. The claim was then paid out to the doctor - not to me - even though my claim included a statement from the Doctor showing a zero balance as well as my proof of payment. After informing Discovery of their mistake, I had to wait another week for the issue to be resolved and the payment to be made to me. Called them this morning and they confirmed that payment has been made, however the payment was made to a bank account which I closed 6 years ago. I have been told I have to wait 2-3 days now for the bank to reject the payment before they can make the payment to the correct account. I find it unacceptable that I have to wait 3 weeks to get my money - this all because of your own incompetence. Luckily the incompetence is only there when it comes to my money; when it comes to your money - my monthly contribution - you don't seem to make any mistakes ever.