Thanks for reply. I understand the sow but how can it be a third party person money. It's my money which he is giving to me to play with. I understand if it was not my money and he was gifting it to me but that's not the case. Also they have been happy for years letting me deposit and make smaller withdrawels but now I win a noticable sum they wanna use it against me. It's just not fair or right in my opinion I think its an unfair use of the terms just to get out of paying. I also had half bonus and half cash so can I get least 450 back.
If you partner transfer you money and you use it to gamble, it's 3rd party transfer to your account and if you use it to gamble right away, it really looks that it's 3rd party funded gambling (including bonus abuse aspect in this case).
We can really only guess and assume here without having same information and documents than casino have. So it was just one assumption that if your statement only shows transfers from 3rd party (was it partner or not but that somebody transfer to you money to gamble) it rings bells as all players should only use own funds and payment methods and if you see statement where all money is 3rd party transfers, it can really look that somebody else is funding your playing and especially in this case where there was bonus available on your account.
Best you can do is try to first sort this out with casino by explaining things for them and possibly provide some further documents they might request as 3rd party money is always raising AML risk and impersonating risk. If you don't get anywhere, you can use PAB service to get help from Casinomeister PAB team who review your case with casino and give their fair opinion is casino acting right or not (just make sure you don't post about issue to any forums, including this if you have PAB in process), link below, hope you don't need it but if you don't get anywhere with casino and feel that you are right in this, with PAB you get fair opinion:
Submit Your Online Casino Complaint - Casinomeister