iCloud storage

Have you also 2 x invoice from Apple?

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

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

You pay monthly for iCloud storage.

On the invoice for iCloud you can click Report a problem.

Or do you use 2 x Apple ID?

Call Apple in your region see: Contact Apple for support and service

Contact Apple for support and service - Apple Support

I have been billed 2 times within 3 days of each other. On April 14 & April 17.

I deleted my Apple invoice because it was already paid on April 14. I did not receive a second invoice for the second charge.

Why do you think you paid twice, if you did not receive a second invoice for the second charge?