Waiting on a cheque for nearly 3 months

Where do I start I signed up to virgin in April this year and it took 5 months to get connected late Aug virgin kept in contact to the day i got sorted the person on the phone told me I was getting compensation and I could ask for a cheque to send to my back I said yes. 

I was told it would take 14 days waited nothing turned up rang up they told nothing  was coming so the re sent again 2 weeks later nothing so rang again they told me it was conflicting with pay monthly paymeant so they took a future 2 months paymeant out and said they they would send another cheque 2 weeks later nothing. So I ring again this time we can sent it straight your bank no need for a cheque it will take 1 to 3 days still nothing. Last Friday I asked for a manager they were meant to ring me with 24 hours got nothing. On Monday a rude manager rang me was not listening to me at all in anything i was saying and said a cheque will be on its way with 14 days. 

The way this company with dealing with me is an utter disgrace from day one getting connected to get this cheque ringing over the phone is a mess you have to tell them your leaving to get threw to someone. 

Am getting no emails no updates nothing I have to ring up every 14 days to a different person going threw the same thing over and over again and it’s really started to get to me now am just tired trying to deal with this simple thing. I just need help or advice on how to get this money or cheque in to my account. Am hoping an admin or anyone from the virgin team can help me.