Yours, confused.com
OK here goes bearing in mind that I don't have access to all your statements apart from what you have posted in this thread.
There are 4 statements listed here that have created your 'bills' or 'debits/charges on your account' as it were, going in reverse chronogical order:
1st July-25th Sept
£215.51
11th May-30th June £147.67
1st April-10th May £143.93
23rd January-31st March £257.82
TOTAL £ usage = £764.93
You have paid into your account (since late January) the following amounts
5 X £80 Direct Debit Payments = £400
1 X credit card payment = £66.04
TOTAL Payments by you = £466.04 since 23rd January
You have also had credits applied to your account of :
2 X £67 EBSS Payments = £134
1 X Alternative Fuel Payment = £200
Adding these additional credits to your payments gives you £466.04 +£334 = £800.04
Your account balance NOW = £800.04 - £764.93 = £35.11 in Credit
and this agrees with the latest account balance you posted.
Assuming that the bill for 23rd January - 31st March starts with a meter reading of 0.0 and ends with 2422.7 then it looks like Eon Next have now got your account in its correct state with the correct bills and correct account balance.
The important transactions to scrutinize in future are those marked 'We Charged for electricity' as these will and do appear in the statements that I referred to earlier in this thread. Once your DD appears in your transactions then the account balance will be a true reflection of where your account stands.
One more observation. Apart from paying merry hell about the way the accounting has happened (and possibly getting a small customer service good will gesture for your worry, time and inconvenience), your electricity usage is such that £80 pcm is unlikely to be anywhere near enough going forward this winter. Don't be surprised if Eon Next suggest a raising of your DD very soon. Having used just shy of 3700 kWh in the period 23rd January-26th September (246 days) its likely you will use circa 3700*365/246 = circa 5500kWh per year (or even a bit more) which would cost approx £1670 pa at current rates or £139 pcm by my reckoning. 👍