115 Butler road ha1 4du

hi, i want to ask you why we paid you in advance, also we have to pay the bill for the same month with Npower?

It is clearly stated on the switch that payment is made in advance, Bulb purchase their supplies in advance.
Any surplus after your final bill with Npower will be credited back to you.

hi, i want to ask you why we paid you in advance, also we have to pay the bill for the same month with Npower?

Please check out: https://help.bulb.co.uk/hc/en-us in particular the two popular articles

We take payments in advance

You’ll never pay for your energy twice