Gas Wells sold to another company and no check

I am in a group of 12 gas wells near Box Church which have been sold to Aethon Energy. The last check I got from SM Energy was in November for June production. I have not received anything from Aethon check, no letter, no kiss my you-know-what. I wouldn't even know the wells had been sold if I hadn't questioned SM Energy on why no check in November.

My question I have any recourse about getting this new company to pay up? If so, who do I contact? Is it the Railroad Commission?

Any help will be appreciated.

Dana Bratcher