False advertising

My husband and I used to love going to Mythos in Cradlestone mall. On Friday he treated me for a lunch date . We both had the yiro lunch special. We asked the waiter to confirm the special and he said yes. We were charged R88/ yiro. I wanted to make a fuss but my husband ask me to leave it because everyone is stressed. On one hand we want to support our local Mythos but on the other hand it doesn’t feel good to be **** to.