D-Mart / Avenue Supermarts — Bad service

At bapunar dmart I want to pay for single item at under 10items purchase counter but only board is available cash counter for less than 10 but all people pay all have more than 10items. I am raise complain to manager but he is not given satisfied answer and told me it is our policy. More people here so I will not give you service. Ur third grade service I don't like.that about wrong board and wrong service.