Do they have a tracking log so you can check past wagers and wins? It's been a while since I played there so can't remember if they have that option or not. If you haven't played anymore since that occurred, the win should still appear on the screen so you could take a screenshot and forward it on.
The problem you might find, which I've had happen before, is the casino reserves the right to void wagers/wins at their discretion, be it due to a technical error or whatever. But you don't suggest anything like this happened, so if you can't do any of the other options, get support to pass it on to their technical desk so they can review the last spins. If you are sure you hit that win I'd pursue it all the way.
Still waiting for those five rams
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