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I changed my plan from FTTB to Home Wireless about a year ago. I am receiving invoices for my Wireless plan. However at my bank I am still be direct debited for my FTTB in a seperate transaction as well as my new Wireless plan.
We'd like to make sure you're only getting billed for the services you're using, @NoelWalker. Send through a private message so that we can help sort this out.