Error storage

If you have upgraded iCloud storage, once your request for iCloud+ has been activated, you should receive an invoice in your email box.

Then check -> Go to -> Settings -> your name -> iCloud -> if you see 50 GB (or 200 GB or 2 TB) then you have an iCloud subscription.

If you have an iCloud subscription, you will receive a monthly bill from Apple, check your email box.

See also the following Apple articles:

How to use iCloud on iPhone -> How to use iCloud on iPhone – Apple Support (UK)

Manage your iCloud storage -> Manage your iCloud storage - Apple Support

That means you still have to wait until you receive an invoice in your email box from Apple.

Check tomorrow again.

if you still need help, get support from Apple directly -> Get Support or call Apple in your region see -> Contact Apple for support and service 

Contact your bank.

Have you receive an invoice in your email box from Apple?

if you still need help, get support from Apple directly -> Get Support or call Apple in your region see -> Contact Apple for support and service

As posted:

If you have upgraded iCloud storage, once your request for iCloud+ has been activated, you should receive an invoice in your email box.

Have you receive an invoice in your email box from Apple?