We got a fake automated call today pretending to be from Ofcom and suggesting our broadband would be disconnected unless I did something. Someone in Minehead got the same call, the common aspect being that it seems to come from our local 01643 calling area. Clearly the number is being faked to trick the receiver into thinking it is a local call.
As with any scam – if they use coercion and fear to get you to do something, it’s probably a hoax. More info on the Ofcom website here: https://www.ofcom.org.uk/about-ofcom/latest/features-and-news/advice-for-consumers-scam-calls-pretending-to-be-from-ofcom