Others who have posted here have reported the very same "refunded or purchased with a different Apple I.D" problem. Unless you have changed your I.D, or perhaps purchased a used computer, I have no idea why that is happening.
You might consider calling Apple Support and see if the savvy techs there have an answer. They have the capability of remotely accessing your computer, that we cannot do here. To contact Support click on the Contact Support item in the upper right of this forum's screen, and navigate to a place where you can input your phone number.
If you have time, please post back with your results, as it might help others who have this same issue.
-- Rich