Hi Ximena Diaz
welcome to the Apple (user-to-user) Community.
Re: "Payment method
I cannot update my credit/debit card"
Apple support have an article online (link below) that may help:
How to change an Apple ID payment method:
If you need to change or update your Apple ID payment method – Apple Support
______________________________
or if needed:
As you have an active subscription:
You may need to add a new card, before you can delete an old card
How to add an Apple ID payment method:
Add a payment method to your Apple ID - Apple Support
How to delete an Apple ID payment method:
Remove a payment method from your Apple ID - Apple Support
_________________________________________________________
Trouble-shooting:
If you need to check which payment methods Apple can accept in your country or region:
Payment methods that you can use with your Apple ID – Apple Support _____________________________
Re: "Are there any Apple people in this community, that may help me?"
No, we are all Apple users. like yourself, in this community.
More support / help is available from Apple Support though:
Eg: Find answers to your questions about purchases, subscriptions, payments, and billing:
or
You might want to reach out to the Billing Support Team:
There is a “Get Support” Link (online chat, phone, eMail etc.)(or a support App you can download) at the bottom of their webpage.
Subscriptions and Billing - Official Apple Support
All the best :-)