Wrong order

I would like to complain about steers V&A the service I got there was not matching the standard.. I ordered Panda burger King and I got wrong order returned and still got a wrong one returned the order 3 times..and the guy who is on duty now claiming he is a manager who tried to convince me that my order was right..I had to take that tiny burger yet I paid for the big one. And no one bothered to come back to me this was on Monday I wrote more than 2 emails