Stop spam calls

Said they where ringing regarding a new business being set up on premises and were asking about changes in tenancy

Claims to be with an energy company, Had several calls which I block and then they ring with different digits at end. Ask if I lived on high street and gave a Manchester postcode. When I said I didn't know what she was talking about she hung up. Guess they want to say no I live at.....

No idea who this woman is, Called from an unknown number first of all asking for a person who doesn't work in our office when I said this she hung up. Called back half an hour later asking for that same person saying it was for our electrical contact. She won't leave a name or number for me and when I search the number nothing appears within a google search.