It’s not wrong, and by law that can’t refuse to take the money as its still current and in use.
We had two run in’s once, one at pizza hut, they weren’t going to take the money in just 5 cent piece’s and once at a servo something like $40 just in silver coin.
Not much they can do hahah SUCKAH!
Ask the pizza boy if you can take their pic while they are counting the coins? Tell them its for sau or something funny