A call centre calling from the above number is advising that they are calling from a legitimate company (UK PowerNetworks) and fraudulently obtaining customer details about currently utility provider details and personal information, as well as potentially banking information to deal with “billing disputes”.
The telephone number they are calling from (verified) is: +442070979235
There are a large amount of reports about this number as listed on here: https://scam-numbers.co.uk/Number/02070979235/
The call centre needs to be flooded with calls to close them down I think ;)