Apollo Pharmacy — Extra charging

Address:

600005

I bought sompraz 40mg 20 tablets from Apollo pharmacy, Lloyds Rd . The attender in the shop asked me to take a membership so that there will be 10% discount and charged me 132rupees. I paid cash and came home. When I verify the cost from the strip it came only 128₹. How can they charge with 10% discount with 132₹. Real cheating. As my house is far away for the sake of 4₹ how to go and collect the difference. RAMKUMAR, mob [protected]