Usually a pending authorisation that clears on its own. If both are settled, contact us — a genuine duplicate is refunded.
Check whether both are settled
A declined or abandoned attempt often leaves a pending authorisation on your statement. It is not money taken and it disappears on its own, usually within a few working days. Two pending lines and one purchase is the common case.
If both have settled
Contact us with the date and amount of both. A genuine duplicate is refunded — you are not asked to argue for it.
Renewals
A Membership or a Bill charges once per period. If you see two in one period, tell us: that is not something that should be possible and it is worth us knowing about.
What causes it
Most often, retrying a payment that had actually succeeded. If a payment screen does not confirm, check your purchases before paying again — a second attempt is a second purchase.