Rocomamas Cornubia Bad Service

I went to rocomamas Cornubia yesterday with a friend and the service we received was horrible! We waited so long for our food(received the wrong drink order) and when it arrived the burger patty was very dry, and the burger buns used were not the ones we normally get (mind you other customers received the normal one) the buns were yellowish in colour and dry. The waiter that served us had a very bad attitude!