as it is openreach who work for all ISP apart from virgin that need to get you connected and cancelling and moving to another ISP will just move you further back in the queue you are already part of
If you have placed an order for BT Infinity, then BT would not move you to ADSL unless you request it, however, if there iis a capacity issue at the cabinet, then you would lose your place in the waiting list.
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Does it say there is a waiting list?