AlwaysSmiling
I received one of these calls and knew immediately it was a cold caller. I put the phone down and blocked the number. I have a cold caller jammer on my phone so it is very rare I get cold calls. I think these cold callers get their info from the energy companies.
They don't need to get any info from anywhere, AlwaysSmiling. They just sit at their phone using an automatic dialler. While they speak to one person, it is dialling the next number, so no time is wasted in between calls. If your number is 1234567890 it will be dialled after 1234567889 and before 1234567891 - unless you are on the list with the Telephone Preference Service. Organisations doing cold call sales and marketing are supposed to check this list at least once every 28 days, and refrain from calling numbers listed on it.
In the UK, the Information Commissioner’s Office enforces the law and has power to fine firms that break it. It is worth getting your phone and mobile numbers onto this list - you can do so (it is free) at www.tpsonline.org.uk/ Some callers bypass the checks, but they run the danger of being reported and fined.