Plusnet are trying to do a working line takeover, which they can't due to a pending cease on the line caused by you giving notice to terminate.
Until your cease goes through Plusnet and other CP's can't raise an order, well they could do a forced 2nd line install but that's costly and not practical.
You cancelling your cease will cost you more money, if you rang up tomorrow and cancelled the cease request, Plusnet would then be able to raise a new working line takeover on Friday, that would mean 2 weeks before they take over, so you'd be charged by BT for them extra days, if for whatever reason something goes wrong with Plusnets order or the new tenant changes his/her mind, then your service would contine until you again gave 30 days notice, there's also usage to factor in, the new tenant could move in and run up charges on your account.
It's your choice but there could be consequences for you if something goes wrong with the new tenants order, personally I wouldn't risk it.
