Unfriendly service - NEXT!!

Although I like Prestons as a place to buy my weekly drinks, I find that their till staff is very unfriendly and unwilling to help. The never smile or greet a person, they just bark out "NEXT" when it is your turn to pay. There is never a please or thankyou. The boys (assitants) that work there on the other hand are very friendly and helpful. I think the cashiers really need to go for customer service training...because their customer service sucks!!!