El Farolito overcharged me by $100. Recourse?

So about two months ago El Farolito 3 (24th & Alabama) charged me $111 instead of $11 for a single burrito. I disputed the charge with Wells Fargo - twice now - and have lost both times. I got in contact with the office for that location last month and at first they were helpful but have now ghosted me. What is my recourse here? Money is tight and I can't afford to lose $100 for absolutely no reason.

Edit: Yes, I went in person. Yes, I've spoken to the manager, who does not work at that location. Said manager has since ghosted me. I ate a $111 burrito and yes it was delicious.