Memberships on 48

When you change up membership cost to 12.99 does it activate immediately or do you have to wait until your existing membership finishes, if so how do I change that?

Contract acceptance

I am about ready to smash this phone off a wall n take a hammer to the stupid poxy 48 sim!! I shuda stayed with Vodafone

Cant confirm contract

Got contract email but cannot see box to tick confirmation

Could someone please tell me how I am supposed to accept the summary contract and am happy to proceed? Every time I try to do it and I click the little square box to indicate that I have received it and am happy to proceed the page just stays like th...