Asian man calling to say there is a problem with my internet connection

A guy with the usual sub-continent accent pretending to be from Telstra called and started to give me some BS about servers and modems.
He called yesterday when I was out so I already had checked and knew the number belonged to J Baker of Harvey Bay.
The real owner of this number has had his phone number hijacked.

Man with indian accident claiming to be from Telstra technical support who have been receiving serious error messages from my system and other rubbish that made no sense - asked me to look at my modem and tell him what lights are flashing. I said no thanks and hung up.

They said they were from Telstra security and said too many devices were connected to our wifi. When the discovered in wasnt going to give them any details they hung up.
Very dodgy beware