I want the Office 365 removed from my mac and my old Office software returned

It is likely you cannot reactivate your old version. Microsoft have declared Office 2011 and early "obsolete" and unsupported. When I tried to install Office 2008 from the original disk with a valid registration key a year ago on a new computer, I could not because MS had disabled the activation server required to set it up. I suspect you will find the same issue with 2011.

However, as MS Office is not an Apple product and there are not as many Office users active here as one would think, I believe you will be better served by asking in Microsoft's Office forums. MS Office questions posted in these forums tend to linger a long time before getting any kind of helpful response.

MS made their forums less user-friendly than before by making it harder to limit answers to Mac subjects, but it can be done when you know the trick, Start here: 

Results in Office - Microsoft Community.

That will display this page header:

1) Use the “Office Topic” pull-down to select your Office app.

2) Limit answers to Mac topics with the “Office Sub-topic” pull-down.

3) If needed, use the “Show Filters” option to further narrow the results.

Everyone there is both and Office user and a Mac user, something you can't say about Apple's forums. I believe you will find the contributors there knowledgeable and very helpful.

What did Microsoft tech support say when you ask them this question?

What version of Office did you have before?

You are most welcome. Contributors here are end-users too, so we feel the pain as well.