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Is jt a possibility that you haven't used your sim card within the last 180 days which would mean the account may have been suspended ?
If so then a person has 90 days to re activate.
Whether this is the issue or not please contact customer service using Live Chat, via a Vodafone phone that works and ring 191 or 0333 3040191
The Vodafone Social Media Team's can help if you contact them via Facebook Messenger or Twitter DM.
Current Phone >
Samsung Galaxy s²² Ultra 256gb Phantom Black.