USA, TX. Dad fell foe MICROSOFT Support SCAM: HELP!

My Dad was mid-conversation on the phone. Apparently experiencing computer problems on his chrome laptop. I thought he was talking to tech support from a service he bought on his laptop. But after talking on the phone I unawaringly help my Dad type run: extensions they ran a scan and was instructing us « foreign address that had hack into our network and used it to buy bet online. Pornhub. They said some illegal child porn thing and we had to check his email. And we did. Nothing and then asked if we had bank activity last 48hrs. To check. And stupidly I guided my Dad to log on his account. Then I was like wait a minute? Scare tactic. Why is this necessary? Then she was like let me put you on hold to see what my supervisor has to help. Didn’t make sense. Then I asked my Dad How did get this number to call in? Pop up « Microsoft support » and he fell for it 2 months ago. I’m worried and concerned and what we should do next??? Please help. I’m so upset.