Best answer by Duppy
The direct debit payment is calculated using the estimated yearly usage that you entered when you joined PP. You will only pay for the energy you use, with a payment that high, I can only assume that you are a high user.
If there is a problem, you need to contact PP via Wattbot, type message the team and explain your problem. They will get back within 24 hours but not weekends.
I will point out that this is a public forum and you should not post personal information