Hi cris, you should report this number to Talktalk so that they can block the number.
One of the calls I had said they were about to disconnect my internet connection.
I said that would be great as my laptop was stolen last week. This confused the caller and after a period of silence he rang off.
Trouble is that most of these calls are made using VOIP. Numbers using this protocol can be spoofed, or made up, or not given. I had twelve calls yesterday [8.11.16] one being from a UK mobile . Spoofed no doubt! One today purportedly from Talktalk where the caller hung up when asked to repeat her name. However the callers number was not avalable.
I too just had a call from 0138808410 saying that she was from talktalk and that i had a problem with my broadband and that i should sit infront of my computer - i politely suggested that this was a known and common way of scamming people and hung up .