Can you extend a Thailand TR visa after multiple extensions and exemptions?

They are not two different visas, one is a visa but they are both tourism entry stamps so don't let that belief get your hopes up

It’s not by law, No extension is guaranteed the 7 days has always been there if extension is refused you get 7 days to exit the kingdom

Was there even truly a 7 Days Tourist Extension of Stay Granted in addition to a 30 Days Tourist Extension of Stay already Granted, or, was it actually an Extension of Stay Application DENIED and 7 Days to immediately Exit out of Thailand?

Also, once any Tourist Extension of Stay, 30 Days or otherwise, is already granted on the current Entry, then no additional Tourist Extensions are granted further, it's just 1 only,

so, a 2nd point that there was no additional 7 Days earlier, and most likely a 7 Days Extension Denied and Need to immediately Exit Thailand

You stayed 30 + 30 then 30 + 7 now you want 60 + 30 . I don't know, but let us know how you go.

If you entered on a tourist visa and was given 60 days, you can extend your stay once with another 30 days.

The 7 day "extension" is more a courtesy sometimes given when a extension is rejected.

Don't think this one is guaranteed even if you get rejected.

That will be up to the immigration office you go to to apply for the extension