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Every day I get calls from 01 203 7800. This is against General Data Protection Regulation.
You can opt out of Vodafone marketting calls by calling freephone 1800200234 and updating your preferences.
Hope this helps
If you would prefer to not receive these calls you can opt out of marketing calls by calling freephone 1800200234. You can also update your preferences by logging into your My Vodafone account.