i cannot buy icloud storage

im trying to buy icloud storage and when i complete all the steps and it says an unknown error. this happens on my iphone

when i try to buy it from pc it says : YOUR STORAGE PLAN WILL AUTOMATICALLY RENEW

i tried to contact apple support but it says : We’re Sorry.

We are unable to complete your request at this time. Please try again or come back later.

PLEASE HELPPPPPPPPP