[Marge]

Whats happened is that some customers have been billed for their February calls instead of their March calls so it's just a case of an adjustment on next months bill. The top and bottom of it is that these customers will be paying no more or less than they should pay over the two months bills.

Feb calls (already paid for on last months bill and charged on this one so credited back on next months)
Mar calls (not charged on this bill so charged on next months)
Apr calls (billed as normal)

So if the Feb calls were £12 and the Mar calls were £10, that will be a credit amount of £2 showing on the Apr bill and Apr calls billed as normal