This may be a genuine BT department number, but sometimes the dodgy so-and-so's will abuse this by spoofing their calls from Bangalore with the real number in your caller ID. If you then call the number back, you get a real BT department, but no further as they cannot route you to whoever called, even if a genuine call was made.
The scam company rely on this sort of thing to make their claim that they are calling from BT to be true. So they call once, leave a message/or not, you check the number, find it really is BT, then when that number appears in your display you think you're talking to a BT employee - but are you?
Yes, I have had this happen. How did I know it wasn't genuine, despite checking the 0800 number displayed - because they wanted to talk to me about and 'overdue amount' on my BT account, and I'm not with BT... the 0800 028 part rang alarm bells when I saw this thread.
The 'overseas' callers can spoof whatever number they want to appear in your display. The latest I had was what seemed to be a local number at first glance, the area code was OK but then I saw the number - it started with a zero, and you just don't get numbers like 01632 066021, they would be invalid without the dialling code.
That means I was straight on to the caller as a time waster, despite their protest that they were only conducting a survey.
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Virgin Cable (L)