More than likely it is a skimmer attached to machine and has nothing to do with Murphy Gas. Slamming the company when they may not even be aware of this, is not the thing to do.
Seems to be a lot of that on here.

If you are sure beyond doubt, contact the gas station so they can check the rest of the pumps.

How can you be sure it was even at that station. Just went through a compromised card and they could not tell me where the number was obtained from only where it had been used.