Refund for credit balance repeatedly not processed

We requested a home move from Virgin back in May and it was finally agreed they would move our services at the end of June. It got to a few days before the move when Virgin decided they could not do it and cancelled our services. There was a balance owing on the account and when I asked for it back I was told that it would take 45 days to process, which I thought was excessive but I was willing to wait.

Fast forward about 50 days and the refund still hadn't arrived. I rang up again and was told that they forgot to process it and it would take another 45 days... When I said this wasn't acceptable I was told they would send a cheque and I would have it in a week. Obviously this never arrived and so I rang up again / went on the chat help and was told they would arrange a bank transfer and I would have it within a week. This never arrived so I rang again and was told that the would send a check to be with me in 24-48 hours. 

Another week has passed with no cheque so I've just rang up again to be told the same story, 45 days but when I push a bit they say it'll be within a week. 

I'm just wondering if anyone on here can help as it's an hours phone call each time I have to ring up and get passed around? 

From all the hassle we had with the home move (a whole other story) and now trying to get this refund, I can honestly say Virgin Media is the worst customer service I have ever had to deal with in my whole life.