Called saying they were from the technical department and I simply hung up. Obviously using someone's elses number

Foreigners are using this number and others to call people stating they are from Telstra and have observed hacking on your internet and how they can help trace/fix it and wanting you to do all sorts of things on your computer. Told "Alex Brown" to bugger off and have reported it to Telstra and ScamWatch. They give you a Telstra Ph number to call back on (NSW) and then give you a Melbourne office address if you ask. Rang the above number who is a legitimate manufacturing australian business who said they got the same call yesterday and now the scammers are using his number to call other. Be aware.