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A payment or a refund. Say which email you bought with and roughly when. The refund terms are on the terms page; you don't need to quote them.

Your data. To see, correct or receive a copy of what we hold, write from the address on your account. Deleting it is faster from the account page — no email needed.

A reading that looks wrong. Tell us the calculation number shown under the chart. It lets us reproduce exactly what you saw.