HP India — New Cartridge got empty after 20 print-outs

hi there, I have purchased "802 Small Black" cartridge from you online on[protected]. My order id is : 571041 ( as printed on the invoice ). I am really surprised the printer shows "Very Low Ink" level, just got empty after 20 print-outs. How this has happend. I request you to please replace this cartridge with a new one. For your confirmation I am sending a snapshop of the blue enveloped on which i have received the Purchase Invoice.