Food is cold

We ordered two chicken burgers, one grilled and one crumbed. We had to wait long for the food. The waiter informed me that the grilled burger is done but not the crumbed. I told him that I do not want the food if it is cold. When the food arrived my burger was cold, as expected. When the waiter checked to find out if everything is fine I told him it is not as my food is cold. He then wanted to warm it. What did he not understand when I told him I do not want cold food. I was informed that the manager told him to take the food. This behaviour is unacceptable. I am about to pay for my cold food that I did not eat, but will not eat in your restaurant again.