There's no way that a support will tell that the game never happened. There is something suspicious about this claim. Unless OP provide screenshot then maybe we can analyze more his problem and move accordingly.
Why should OP prove his case here? The issue is not whether OP is lying or not. He gains nothing lying in this thread. And whatever analysis people do here will not convince the fortunejack support as well.
If he has all the evidences and the screenshots, he should just send them all to the fortunejack support.
I think the site is supporting several languages. If the language of the OP is not included in those, he has no choice but to bring everything to their table in English. It is not that hard if he is bringing with him the right evidences.
Actually, there are times when odds are cancelled even if a wager on that odds is already accepted by the site.
OP must provide more proof if he wants to establish a cause against the casino. Fortunejack has historically been infamous on poorly handling user accusations. The OP would not have made this post if he was satisfied with the response from the support. And this forum is the best place to make and settle an accusation.
I agree with the post above yours. OP must provide the proof but if he provides it in this thread, he will get nothing and his case will go nowhere.
It is either he will exhaust all means through FJ's official support mechanisms or PM FJ's official account here or post in FJ's official thread.
If everything will not be given due response, OP should just post a thread in reputation.