Why am i being charged 3 times for icloud storage on 3 different decices

Not if yo9u are using the same Apple ID on each device. iCloud storage does not add up like that. It is toed to an Apple ID.

You get 5gb, 200gb or 2 TB.

I suggest you call support to ask.

https://support.apple.com/contact

Are you signed in with a different Apple ID on each device?

How do you know that you are being charged three times? Are you getting receipts from Apple indicating that?