These are absolutely scam calls. Microsoft wil NOT call you, EVER unless you personally called them and they made an appointment to call you back. Other than that MS will NEVER call you.
Based on what else you have said;
This is now a very common tactic for scam callers, showing you your own number or the legal correct number of somebody else. See this information directly from the FTC. If you can *69 a number and see who called you then you obviously have a phone that is Caller I.D. capable, why aren't you using it? Most phone companies today do not charge for this service if it is included in your chosen package and those that do the charge is minimal, maybe around $10 a month, but well worth it as you have found by continually using *69, which my phone company at one time charged 10 cents for each use. Now my phone package includes caller i.d.
Please note the advice they give:
You need to call your phone provider and ask them about caller i.d. and if they offer it then have them activate it.
Now for your computer question, which has absolutely Nothing to do with the scam phone calls; I doubt that you have been hacked. Can you clarify this please:
Do you mean that SAS found these and therefore deleted them? If so then this tells me that you do not have your browsers configured correctly. Firefox has changed with recent updates and you must reconfigure it to correctly block tracking cookies. You say you go no place else except NWT.
So you are saying that no other page is ever open on your browser....I mean EVER. You don't have a home page other than NWT. So you only use your computer to look at NWT. Once you have done that you turn it off until the next time you want to read at NWT. You really have never EVER read the news, looked at a sports score, checked a driving route, grocery prices, used google, etc. EVER??
Does anyone else use your computer?