It is somewhat strange that after the apparent scam alerts after opening a link in an email (this is often an indication of a ransom-ware attempt), but to subsequently receive a telephone call.
How would they obtain a telephone number and subsequently have this organised attack path. Whilst there are many reports of speculative call scams by people telling you that they are from (Microsoft support, or other known service, etc.) you have a problem with your PC. It would be too much of a coincidence to receive both of these together.
As far as emails go, don't open unsolicited emails, don't open attachments in unsolicited emails and finally don't click on links in unsolicited emails.