How can I change my apple care payment method?

So I just got off a 2 hour phone call with apple and Best Buy, I need to change my apple care payment method and I bought my phone and the apple care from best buy and apple said I have to call them to do it and They said they don't know how. Any1 know how I can change it through my phone? I've gone to generale and about and apple care and subscriptions but there's no option to change anything! Can someone please help me? Thank you so much for yalls time have a wonderful day !!

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