At least they apologized. I've heard of some sellers who just brushed it off. And yea, definitely push a bit for a deal.
How far is the distance between you two? I've seriously considered buying a betta online before, but I wouldn't be comfortable having my fish shipped over more than a few states (unless it's imported, because I know there's some special system there).
And now these three remain: faith, hope and love. But the greatest of these is love. - 1 Corinthians 13:13