Still waiting for a phone call

My daughter and I visited Cotton on -Gateway last week and after standing in the queue for 15 mins,I asked to see the store manager to find out how such a big store can only have 1 cashier working. A lady claiming she was the supervisor said that the store manager wasn’t available and I asked her why there are no other till points. She said “that’s the way it is-and I can’t do anything about it”. I then asked asked for the store managers mobile number so I could call them at which point she said she doesn’t have it. I then gave her my details and phone number and asked her to please ask them to call me. Well,surprise surprise almost 1 week later and still no phone call. My question is -how does a big clothing store operate with only 1 cashier in all departments?