[Paul]

BT would have connected you to whatever exchange your line was running to, unless they physically laid your line brand new on the day they reconnected you then you will always have been connected to that exchange and cannot be moved without a lot of expense being incurred.
Unless you have a fault on the line or BT can see a problem with your connection to the exchange you will not be moved. How do you know everyone but you in your area are on a different exchange??