@MichaelH29
If you are saying that payment has left your bank but O2 claim not to have received it, I suggest that you speak to your bank before contacting O2.
You need to ask your bank for the unique transaction identification number, which is likely to be sixteen digits in length. If you provide this to O2, they will search their accounting systems and locate your payment. It is likely to have ended up in a suspense or unidentified remittances account, or alternatively to have been credited to the account of another customer.
