Email [email protected] and we'll close it and delete your personal information, apart from records we need to keep: any Letter of Authority you signed, your consent records and payment references, kept for up to six years because they prove what you authorised and to meet financial-record rules; support or complaint records, for up to three years after the case closes; and anything else we need for a legal, accounting or dispute reason, as our Privacy notice sets out.
If you set up services through helloBill, those services carry on exactly as they are: they're arrangements between you and each provider, and your Direct Debits keep running as normal.