It could simply be a database error. The only way to find out would be to order a fibre based service - BT Would offer you "faster total broadband".
This sounds exactly like the same issue we have been experiencing.
How would we go about ordering 'a fibre based service - BT Would offer you "faster total broadband' if when you go through the BT website or speak to customer services and they still say no, when we have neighbours all around us with fibre broadband?
If it is a database error then you would get the faster speed with the faster broadband package. The only downside would be a 2Mbps upload cap.