Staff were very rude

We bought 2 rib burgers on the 16December 2017 and the burger was not grilled then went to show the cashier she told that the is nothing and I said to her look the cheese is not melting what does that means I call supervisor then she said its raw the was guy at the kitchen he said we deal with serious people they were shouting saying I like free bees and call their call centre they said they will review the footage when I do follow up they told me that I was harrasing their staff I don't know how to harass while you are not happy about service and they even use f word I was like stupid at there even other two customers they told them that this burger is raw and cashier was rude telling us we think we will get free bees