Almost certain legitimate
O2 are slowly moving people on to a new accounting system
Those moves mainly take place on Saturdays and Sundays A few of this type of post are appearing here
If worried
Message O2 on
Facebook (https://o2uk.co/O2CFB)
Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG) ,
they should be able to help you.
This is not O2 and we are all customers here similar to yourself and cannot answer account type queries.
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