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I can't find how to contact O2 to cancel a data only sim on refresh. The contract ends in July. I am advised to contact O2 but no number provided.

My O2 is not showing my final bill for the number that I kept after switching to prestige. Phoning results in automated message to check my O2. How do I get a final bill in this situation? The bill was paid on 30th March by direct debit. I need an on...