Flipkart — dell laptop charger

Dear sir/ma'am,
I have received a dell laptop charger with a wrong pin which is not compatible with my laptop. My laptop requires a charging pin of wider diameter and the charging pin description was missing in the details section hence i could not figure out the right one from the description.
When i wanted to place a return request, they did not allow me as i was given only the replacement option. What will i do with the same product which is not compatible with my laptop? My money will go to waste. Kindly refund my amount or exchange the product for a compatible one. I
Would have ordered it from amazon which is giving me in a much lesser amount and with an easy return policy.