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Are you using a home hub 5 or home hub 6?
Is it connected to exactly the same point as the home hub you were using on ADSL?
Its not that easy to go back to ADSL, as that comes from the exchange, and the filters in the fibre cabinet would block it.
Have you checked that your phone number is the same?
Unless people want BT Vision, and the extra TV channels, or they have a very poor ADSL speed, upgrading to Infinity is not really worth it in my opinion. There is a higher fault liability with equipment in street cabinets, compared with equipment in exchanges, where the environment is controlled.
Have you had any joy mate? I'm having a similar issue and am really worried how long it's going to drag on for.