In a nutshell....
Over the last 3 years you have dutifully let the meter reader in or, left your completed 'meter reading card' in the window....
Each time a new bill arrives you have to call your supplier to give them the correct figures...
Each time you have this conversation you have a subsequent conversation about the fact your meter is an old, dual rate, one - from when the last owner had the place, they had storage heaters which used old Economy 7, nighttime, tariff. This conversation always ends with said supplier sending someone round to read the meter and to 'make arrangements for a new meter to be fitted'. The meter exchange does not happen. Again... & again (repeat to fade...)
Overall though, this is a minor frustration, the bill is accurate and your payments are such that the credit run up in summer covers the winter months..
However, late last summer, you get the bill, you notice our credit balance is unusually high - circa £500 above the expected.
You check the figures and realise that someone has transposed the Economy 7 tariff reading (the one that does not move as it's not used, and they still have not changed the meter...) with the correct tariff.
Being diligent and honest, you do the math, work out the correct position and ring the supplier.
The first thing the young lad on the phone says is 'oh, that's quite a credit, would you like us to refund some of it...?'
You say no and appraise him of the situation.
He looks back in the records, can see the previous readings, can see what happens and so, it is time for corrective action!
Lo! They send out someone to read the meter.
Double Lo! They finally actually swap the meter for a new one.
Ta-Da! You get a new bill, expecting all to be correct at last...
Nope - you're now in credit to the tune of £900 more than expected.... It would appear that, instead of revising the credit on the acct down, to account for the correct figures you gave them, they have credited the account with that amount...
WWYD? 
