Fake calls claiming you have a fault on your broadband connection.
I often get these calls to my virgin landline phone, from fraudsers usually asking if I am a BT customer so I just say "wrong number" and that does the trick.
Sometimes they just say your broadband is hacked etc. and your details are compromised.
Usually the voice is an indian or female chineese/philipines accent with poor clarity and they do not provide any name, and the clue is the phone number will not be a virgin phone number they are ringing from and somtimes a witheld. phone number, I have recently had one on my virigin landline phone on 14/04/2022 (bt call)
Always put down the phone if unsure, and contact virgin directly yourself if you need to check if a call was genuine, but my understanding is that virgin do not make these type of maintenace/fault calls.
The fraudsters will target landlines and also mobile phones inceasingly these days, I had a fake virgin call to my mobile phone also recently.
Note, although witheld number can be blocked, I do not block them as NHS calls we sometimes receive use witheld numbers for security.
alf28