Happened to my uncle, he records all calls so he was able to show us. When they let him speak to "his son" he sounded just like him and even used the same greet

Happened to my uncle, he records all calls so he was able to show us. When they let him speak to "his son" he sounded just like him and even used the same greeting his son normally does with him. Was very creepy. And his real son had his phone turned off during that time. The really weird bit is they didn't ask him to send any money out. They knew his address and some "police" showed up an hour later demanding he write them a check. This is in Canada. They've apparently found the guy, but there's some difficulties because he's in a different province.