Payment issue with upgrading iCloud storage

Firstly, please check your purchase history, - This will allow you to see what you have been charged for and when to confirm what the charges are actually from

Secondly, you can follow the steps at Request a refund for apps or content that you bought from Apple – Apple Support to request a refund if required, but please be advised this is up to Apple's discretion, on whether a refund is, or is not permitted.

iCloud Storage is a monthly subscription, so it is unlikely you will have been billed multiple times for this.

Let me know how you get on!

I would start here and see where that gets you.

Request a refund for apps or content that you bought from Apple - Apple Support

Or maybe you can try this way. Billing and Subscriptions would be the place to start.

Apple Support