Bests & Worsts Reviews from Amazon

Product is fine and I'm very happy with it, HOWEVER, on 3 of the 4 bottles I've bought (two bottles twice) there's a very large offer with no expiration date, to get 2 bottles free on next purchase by texting DAKOTA to a certain number which will respond with code. BUT THERE IS NO RESPONSE! I've been trying to get my 4 free bottles but their offer seems void while still being advertised!