They are an energy marketer whose autodialler hung up as soon as I answered. I called them back immediately and they said they were closed but there was an automated facility to opt out of further calls from them. They even offered the option to input an alternative number to be on their "do not call" list

a**hole telemarketing !!

Select and Offer phoned asked for my by name, I questioned where my details were provided to them from and the person hung up. I phoned back and there is an option for opt out. Opted out so Ill see how it goes.

They use several numbers - all spam.
Block these guys.

I had a missed call from this number. No message left; further research revealed it was a spam call.

Random telemarketing

Got my name wrong!!! Obviously telemarketing. Block them.

Block this number then they just call back from another 03 number. Have blocked about 7 different numbers now

Offering discounts on power, I got three calls in one day

Said I was entitled to a discount for my electricity. I asked him which company he was from and he tried to avoid my question. He ended up hanging up on me. It was Select & Offer.

Spam marketing

Spam. Unsolicited 'offers'.