Make sure you find the number yourself (from a letter, statement, the phone book, or their official website) and don’t use the one provided by the caller.
If you’re using the same phone, try calling someone you know first to make sure the line is free, or wait at least 10 minutes between calls to make sure scammers have hung up.
Legitimate IT companies don’t contact customers this way.
Read our section about staying safe online for more tips and advice.
Alternatively, they may say your money or your bank account is at risk if you don't give them the information they need right away.