If you were porting your number from Sky to BT ( or if the number were originally BT and its returning to BT so they can re-supply you with it ) then why this other number ?, were you told you would get this ‘new’ number temporarily until the wanted number could be given ?
If the FTTC cabinet isn’t ‘ waiting list’ , perhaps the work ( done by OR not BT ) hasn’t been done correctly, leaving you in this state....AFAIK, you should get some sort of ‘welcome’ message , including if it’s not working correctly to contact BT, have you had any such message and if you have , did you respond that everything isn’t working ?
As already stated it could be something to do with the porting of the number, especially if the number was never previously BT’s, but a number from Skys number range, as that’s a proper port rather than a nunber returning to the original number range holder, unfortunately things do go wrong, there are at least 3 company’s involved, and people only tend to publicise when it goes wrong not when it goes OK, no comfort to you, but most migrations work first time....if you haven’t already , you need to inform your new provider that you have no broadband service
Openreach don’t pre allocate ports to providers , all ports are available to all providers, should the cabinet run out , then OR consider if to upgrade and what type of upgrade to provide, if the cab is waiting list , no provider can progress an order, if they do , and it becomes clear they cannot deliver FTTC , they normally offer ordinary broadband ( presumably what you had with Sky ) until a port becomes available
