Hi Azza I would tell WGT that if they can´t verify if or not you became the innocent victim of a bug caused by WGT they need to refund you anyway.
You did your homework in researching the cause of your problem. WGT
did not. They just gave you a canned answer. The poorly working database is WGT´s problem not yours. Not refunding you is bordering on fraud.
There are lots of clues that WGT no longer has the bugs in their database under control. Currently most annoying to me is that I often get presented the wrong background image for my shot. How you even can create this effect in a production database is beyond my understanding. There are just a few thousand images. And it is totally obvious which one is needed next. But the WGT database often fails do do this simple job correctly.
I don´t do skin games for credits. But similar bugs often affect me when trying to do a multiplayer game with friends. I know that they don´t abandon our games voluntarily. So if we get separated during a game it is due to a bug very similar to the one that affected you skin game.
Andreas