Worst and terrible service at Wimpy Walmer Park

I visited Wimpy in Walmer Park today where I was served by a waitress known as Given. She wasn't polite and took an entire 20mins to take my order. During the meal she didn't care to ask if I'm good or needed anything instead whilst I was eating she rushed to offer me a bill that time I had food on the table. When I returned the slip for the payment that's due she was angry and responded with an attitude when I asked her for a receipt. I have reason to believe that black customers are not treated fairly as they should as she treated the white couple next to me with empathy and care. This is not the service I expect from such a big company