Thanks for your reply. I am, however, still confused so perhaps you could explain in more detail. I've done quite a few options, many calls, but not involving a merger. Some of my covered calls have been called ahead of expiration and I would receive the strike price times the number of contracts times 100 and finished. When this was exercised early, I received the adjusted strike price of NRGY from $20 adjusted to $16 and the difference in SPH shares which also got taken. This happened a month before expiration. My shares were taken and I received an amount equal to the 20 strike price. It seemed, like any exercised early option, a done deal. This past Friday being the expiration date should be irrelevant.
I hope I'm clear as to what occurred and, if not, I'll call my broker and hopefully not have to go through too many levels.
Thanks again whether you give it another go or not.