Processing of Refund as Glenburn incorrectly invoiced

Customer experience has been disgusting when it came Glenburn Lodge processing my refund. When checking in my wife was in the car and I went in to pay the balance, so I was billed an incorrect amount and payed it as I was not sure of remainder of the balance left. I was shocked, told my wife when I got to the car that why is this amount so high as if we did not pay when booking. We went back to find out details as to why we billed double the amount we supposed to be billed. They said they had made a mistake, we will get our refund when we checkout. Upon us checking out they could not process the refund and we were told to leave our banking details and this would be processed within a day or two. It has been more than seven days now and I am still waiting. i have followed up three times with them and I keep on being sent from pillar to post. Its either they would say that the person that was handling my issue is not in, they will ask and given me feedback. I would not even get a courtesy call to update me. Got fed up and asked to speak to General Manager Nigel Peel as i was not satisfied with feedback received from Supervisor, I was told that the lady that handles accounts is not available and I will be given feedback tomorrow when that lady is at work.