RETAILER NOT AGREEING TO GIVE REQUEST IN RETURN

HI,
I WENT TO A RETAIL STORE CALLED PUNEET SUPER MARKET IN DHARAMPETH NAGPUR. I WANTED TO BUY A COLDRINK WORTH Rs 75 AND I WENT TO THE COUNTER AND GAVE MY DEBIT CARD. THEY TOLD ME THAT THE MINIMUM SWIPING AMOUT AT THEIR STORE IS Rs 100. I ASKED THEM IF IT WAS WRITTEN SOMEWHERE IN THE STORE AND PASTED ON THE WALLS FOR CUSTOMER TO SEE. HE SAID THAT ITS THEIR STORE POLICY. HE REFUSED TO GIVE IT IN WRITTEN WHEN I ASKED HIM TO WRITE IT DOWN FOR ME AND STAMP IT. HE SAID I SHOULD WRITE IT AND HE WOULD STAMP. THEN I ASKED HIM FOR THE PEN AND HE SAID I LL NOT WRITE DOWN ANYTHING FOR YOU. DO WHATEVER YOU WANT. I DONT CARE. THESE WERE HIS WORDS. I DONT UNDERSTAND WHEN A COMPANY LIKE RELIANCE FRESH AND BIG BAZAR CAN LET ONE SWIPE THEIR CARDS FOR Rs 2. THEN HOW CAN THIS STORE HAVE ITS OWN POLICIES AND EVEN IF ITS THERE, WHY CANT HE GIVE IT IN RETURN.
STORE ADDRESS: PUNEET SUPER MARKET. MATA MANDIR ROAD. DHARAMPETH. NAGPUR-440010

REGARDS
RIECHA S