I think a few people have mentioned this, but it's still on the go. Got a call today from obviously a long way away - Indian subcontinent at a guess - reckoning they were from VM support and they were trying to check my broadband speed. I went along with it as far as running the https://www.speedtest.net/ utility.
After that I suspected it was a scam and wouldn't speak any further. Beyond that they start trying to get into your hub etc apparently.
They had suggested that i was on M200 so my broadband speed should be 200 mbs (?)
My results were Ping : 9 ; Download 112 mbps; upload 10 mbps
It doesn't look like the speedtest site is a problem (is it?).