Bigbasket.com — spoilt duck meat delivered

Address:	560036
Website:	www.bigbasket.com

I am really disappointed that spoilt duck meat was delivered by big basket! It was three packets of 500gms each that was delivered.
As soon as the duck started cooking i realised that the duck was spoilt. I dint realize while i was cleaning the duck because may be only one of the packets was spoilt.
I raise a complaint and they agree to refund just half the amount. When asked for the reason, they said the meat had to be returned to them uncooked.
I don't understand this. Had i known that the duck was spoilt while cleaning why on earth will i cook the duck and then raise a complaint?
This has been a very bad experience.
I hope these people are adhering to the rules set.