A mod should have different methods of contact attached to their profile (Twitch channel, discord, twitter, etc.). Try those. If that doesn't work, you're a bit out of luck unless they see this or someone brings it to their attention.

That said:
a ) I remember reading from a previous post that game requests are automatically rejected if the submitter does not have a method of contact in their profile, which I note you do not.
b ) A mod is usually in the right for their reasons for rejecting a game. If the reason seems weak, the game has probably been submitted and rejected before.
c ) I'm not sure how a glitch could be grounds for rejecting a game unless I'm misinterpreting your statement.