I've been a good 5 times over the last 3-4 years, and everytime they manage to make a mistake on the bill. First few times, I may have suspected it was just a mistake, but after that I can't help but to imagine they hope I didn't notice.
My last time visiting this place, they harassed me to give them more tip when I already gave 15%.
It's a shame they need to pull these lowly tactics as I do enjoy the food.