Has anyone shipped back seeds to vendor? Strain Advice Needed!

I just received my order from Dope Seeds. Delivery time was great, yet I was sent the wrong seeds. I ordered White Widow & Northern Lights, however I was sent White Rhino instead of the Northern Lights. I was told I could send them back and receive some freebies but am a little skeptical about sending them back overseas. Has anyone ever done this before? Also, can anyone tell me if I would just be better off keeping the White Rhino from past experience? Any help would greatly be appreciated.