It was most likely a scam to get into his computer. I would think about changing passwords, email passwords and notifying credit card companies. Microsoft has an abuse department but only occasionally do you get a lot of results from them. I think in this situation, as I understand it, you have to assume your data has been compromised and take appropriate measures.
If you need help installing Windows 10, we can help with that.
When you say problems reloading because of "portions", do you mean "partitions" on the hard drive?
As @essenbe said, it's unlikely a report to Microsoft will produce much; there are tons of scammers taking advantage of the W10 rollout. However, if the 24/7 tech support company your father dealt with 5 years ago is indeed legitimate, perhaps you might notify them that scammers are using their name to ransom people's machines. Bottom line, if they called you, it's a scam.
I also agree with @essenbe, that your father should seriously consider changing all his passwords - you just don't know what information their "software" was able to grab while on his computer. You must assume that all data was compromised.