Terrible service

There was a mistak and a double booking was made for a flight and I am owed a refund.. I was given a no. to phone which I did. I got through on my 2nd attempt after waiting 23 minutes. 1st attempt i waited 17 minutes. I spoke to a consultant who said I was due a refund but unfortunately her manager had left so she would have to phone me back the next day. That was 5 days ago. I have phoned again and gave up after waiting 26 minutes on the phone. The service from Commair is bad and frustrating.