Declined payment of winning due to no history

I deposited 15€ without any bonuses etc and playes a game and won so I could make a withdrawal of 30€. I then got an eamil that said that yhe withdrawal was declined due to no history of me pplaying in their system. They accused me för cheating with their system, servers etc and I couldnt believe my eyes and were chocked when I saw the mail!! Accusing me of "hacking" their system made me feel so bad and sorry! I checked it though and there were no history but I had not done anything to their servers etc. so its a false accusacion and a big mistake from them cause its their systenm that fails and not me that has created this issue.

They had put back my money in the account (30€) so I told them I will now play for the 30€ and then check the history. I played and checked and there were nothing. (The playerpoints had increased though!!)

I begged them in several of mails to solve this but I got no answers at all! I want my winnings and it doesnt matter that it is only 30€ cause this is a false accusement that I feel so bad about!