Walking away from Cai Fan stall after ordering...???

was at a foodcourt with my gf just this evening ordering cai fan. Prices clearly stated $2.50 per meat, and $1.30 per veg, 60c for rice, tabao 50c.

i got 2 meat 1 veg, with a normal serving of rice, tabao. so logically the price should be $7.40 right? at that point i didnt calculate but was expecting around the $7 mark. but the uncle manning the stall charged me $11.60.

so obv i got a shock and asked for a breakdown. he said black pepper chicken (one of the meat i chose) is a 'premium meat' so its more ex, and the veg i chose 'inside got seafood'. but during ordering i literally said "这个菜" and he picked it without saying it's not a veg but a seafood item. he also didn't say the meat is higher charge or whatsoever, furthermore there isn't any sign that says they have extra charge. (btw the meat is also chicken pieces, not like the pork chop type so i assumed it's a 'normal' meat? and istg the only 'seafood' in the veg i saw when he showed me the box were tiny anchovies)

i was like 'whatever la' and i wanted to pay alr as i had a long day and honestly cba😂 and the price, although high, was similar to what i would have paid in aus....

but then my gf got mad and confronted the uncle lol....said we don't want it, and then pulled me away. uncle shouted at us, and gf shouted back. then we just walked away...thankfully there weren't many people around and there was no queue at the cai fan stall...otherwise tmr our faces on newspaper hahaha

but yeah...any advice on what i could have done better? or any possible 'ramifications'? anyone did the same/experienced the same situation?

honestly i'm still scared that our faces appear online/on newspaper tmr lmfao🤣💀

ps- i've been overseas for almost two years, but before that have regularly eaten cai fan and never experienced this before lol...so is it a 'me' problem or the stall's problem lol? haizz