Yeah man I know how you feel, personally I've actually stopped moving casino sites to get bonuses I just play with raw cash now on 2 websites as I can't be bothered keeping up with what I can / can't play and I very rarely ever made the wagering requirements either. I just like knowing that what I've won I can cash out straight away etc, but each to their own!
I only just realized they are promoted on CG, which is really disappointing to see considering their fines (two of them I believe) from the regulators.
You can always open a complaint on AskGambler or ThePogg and that may speed up the process, I may be wrong but I think decisions on POGG are like a type of mediation and as such are binding if the casino itself is signed up to their website, but take a look yourself and see if that's any help.
They said above that they paid you and the issue is with Worldpay, I noticed that when this happened to me my withdrawls were still showing as pending on their website, so I told them if they had been processed like they claimed they wouldn't be "Pending" and it was after I pointed this out to them that I ended up getting the money a few days later, you should check that too.
Good Luck!