I ordered the 6 pieces of shrimp for 3.99. Anyway ...

I ordered the 6 pieces of shrimp for 3.99. Anyway the shrimp was awful, I ate 2 pieces I thought maybe the first one want cooked enough, then my boyfriend tried one and he said it was awful also. So when i went to go pay the bill I told the waitress, so she got the manager. So he adjusted the bill (originally it was 30. and some change) he handed me the new bill and it was 28. something about 1.50 lower! I asked how does this work, the shrimp was 4 dollars and the bill is only 1.50 less?! He said you ate 3 pieces of the shrimp. I said fine, I'm not coming back here again! Also, it's not the first time I had food there that want any food!