Unfortunate Red Card Ruling on Newton

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Hi everyone -- I just wanted to hopefully have a conversation about a red card ruling we were on the wrong side of in the Newton division, Match 123.
My team (4276) was sitting in our own courtyard to play defense next to the batter when an opposing robot (Team 1296) drove over an outer works and eventually into our bot.

Unfortunately, as they drove into us their bumper caught above ours and caused their own robot to tip sideways. We backed away immediately, and about 10 seconds later Team 1296 was tipped back upright and continued the match as usual.
After the match we were issued a red card (deducting 4 ranking points from our team).

Team 1296 immediately came to our defense, explaining to the ref that they didn't feel it was intentional, that we were not at fault for the tipping.

When my students approached the question box and spoke to the head ref, the ref explained that what we did was a yellow card and a foul, and the combination of these two penalties automatically results in a red card. Besides a mutual agreement between teams that the tipping was not intentional and did not affect the game, I didn't think the ref's explanation about this was accurate (we were never issued a yellow card for any other reason at Champs).
I don't think anything can be done at this point, but I am just not sure we were being treated fairly by the refs in this case. Is there any process in place to discuss these things at the competition when an obviously very busy head ref simply doesn't have the time to hear us out and let us explain the situation?