... they do is create folse details by stating to you that they have reversed a previous charge but add this as a minus amount let's say you have 100cr in your eon account and you want to take this amount out they will do a reverse previous charge for 100 but add it on your account as a -100 ... etc...etc...
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C383hbv - what you're attempting to describe is something called double entry bookkeeping which is the fundamental of all accounting practices.
For every account movement there has to be an equal and opposite movement where money is moved into another account, which allows the books to be kept in balance.
For instance if your EOn account stands at £100 and your bank account is to be credited with plus £100, your EOn account will be debited by minus £100 bringing your EOn account balance down to zero and keeping the accounts in balance.
If you haven't seen the credit of £100 into your bank account you need to contact customer services to query why this transfer hasn't happened.
What you may have seen on your account could be a recalculation of your energy costs since maybe you weren't actually £100 in credit due to estimated meter readings. They occasionally have to recalculate the true account balances since they won't credit you money which they don't actually owe you.
This can get particularly complicated if there have been tariff changes during periods of estimated meter readings since how do they know how much energy has been used at various times during the estimated readings.