SO DISAPPOINTED in an Ebay purchase!

Title says it all! 
I got duped in an Ebay purchase. I bought a G1 Shrapnel figure from someone that never listed it as INCOMPLETE, they just showed a front picture of it and it read:
Vintage Transformers G1 Insecticon Shrapnel Decepticon Original Figure !!!
This is a very nice figure.
Every thing is in nice shape with minor play wear.
See pictures for details.
Quarter in Picture for scale
When I got it today, it is missing the 2 yellow legs that are needed for it to stand (lay) in robot/bug mode. SO DUPED! I think this is uncool of the seller no doubt.
Anyway, how can I (or CAN I) go about purchasing those 2 yellow legs?
(yes, I already sent a message to the seller telling them I didn't appreciate the duping)

I got duped in an Ebay purchase. I bought a G1 Shrapnel figure from someone that never listed it as INCOMPLETE, they just showed a front picture of it and it read:
Vintage Transformers G1 Insecticon Shrapnel Decepticon Original Figure !!!
This is a very nice figure.
Every thing is in nice shape with minor play wear.
See pictures for details.
Quarter in Picture for scale
When I got it today, it is missing the 2 yellow legs that are needed for it to stand (lay) in robot/bug mode. SO DUPED! I think this is uncool of the seller no doubt.
Anyway, how can I (or CAN I) go about purchasing those 2 yellow legs?
(yes, I already sent a message to the seller telling them I didn't appreciate the duping)