Moving phone from BT to PN and upgrading PN ADSL to fibre

Hi folks,
I'm currently considering moving my phone from BT to PN and upgrading my PN broadband to fibre, so have a few questions...

1. BT bill me 3 months in advance for line rental and their 'anytime' call plan - if I switch to PN midway through a billing period, will BT refund the unused portion ? (I'm way beyond the contract period for my package)

2. I don't have the option to select PN's line rental saver when upgrading my ADSL to fibre via the website - is this possible ? (I'll be using my mobile for calls from now on so don't need an inclusive call package)

Thanks.