Serving of Frozen Sausages and Cardboard in Food

I went to Tasha's for breakfast this morning and ordered the Bacon Rosti with an additional serving of sausages. For one, the Rosti arrived without the sausages, only 5 minutes later were the sausages brought to the table. Secondly, upon cutting half the sausage and eating it, i realised it was still frozen cold in the middle. I then called the waiter, who gladly returned it to the kitchen. Another 5 minutes later, the same sausages from which i had cut and eaten were brought back to me- not even replaced with a new ones! Thirdly, upon continuing my meal of the Bacon Rosti, i came upon something inedible- only to discover it was a piece of cardboard! The manager was called and i explained what had happened and what i had discovered in my food, and refused to pay for the meal, at which he at least accepted. However, this is not the standard of food i expect to receive anywhere, never mind at such a reputable restaurant. Clearly there is a lack of quality control for the food leaving the kitchen, as well as remorse for unfairly treated customers.