Hello, Elisha.
It's not entirely clear what's been done on the account, as upgrade and new contract typically mean different things.
If you upgraded, you'd have the same phone number, but your plan would change to whatever deal you accepted, and you'd simply move onto paying for the new amount once your last bill at the old amount has been collected. It's a smooth transition and doesn't involve making any additional payments.
If you took a new contract out, this would typically mean you have 2 contracts going concurrently, and this would mean you have two charges to pay, one for the old one, one for the new one. There would be a new SIM with a new phone number on it too.
If you're not sure which of these two scenarios fits what you processed best, I'd recommend checking in with the support team to get them to confirm what changes were actually made.
Pete.
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