Terrible service from teller

I came to limnos Cavendish square for some alone time just to relax enjoy a hot beverage and a lovely piece of cake but to my regret the cake was horrible, although the service from 2 of the staff were nice the lady in the front area with the black on at the till does her utmost best to make guests feel unwelcomed and uncomfortable while sitting down watching how she rudely tells this guy how things are expensive I work in hospitality and this type of service is something I would never tolerate