Best answer by Strutt G
I guess you have contacted PP by the regulary advised method.
Do you understand how to work out your energy consumption from month to month leading your annual usage which is projected on your monthly statement. This projection will alter each month as your usage average pans out based on your metre reads that can frequently sent.
Sounds like you need some feedback from PP including an account and or DD review.
Good luck and revert back as and when required, lots of members ready to advise.