Fraudulent call or meter number

Hi, I received a call from a gentleman with an Indian accent saying he was from Bulb and that he wanted me to check the contract for the meter number because there was some problem with the meter readings. He was calling from 01714331522 which I assume is spoofed. Why are scammers seeking this info?

@Giles, with your address and MPAN, they can switch you to another supplier.

I wonder which supplier they were trying to switch you to…