Burger taste like old oil

I order chicken burgers from them previously and was crispy and not to bad. Till the last time. Call the bussiness and man answer. Explain to him the poor condition of burger. Patty very oily like old used oil and funny taste. He responds is like point take and look into it. Halloooo, I paid for this ****. After telling more and more about the construction of a poor burger he finally got irritated and said. Bring back the burgers and we will replace it. Really, replace it with the same fried old funny taste oil. No thanks. Replace regular your oil to preduce good food please. That is all I wanted bring a cross.