Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello
Is it because you are no longer in Spain?
If so, the support advice given to you is correct. Microsoft 365 products are country restrictive. If you are no longer in Spain, you have to let the current one expire first. Then update your profile's info to match the current country you are in, and add a payment method from the new country. Then subscribe to the premium plan.
It is all explained here: https://support.microsoft.com/en-us/accounts-billing/change-your-country-or-region-in-microsoft-store
As long as you do this with the same Microsoft account, as soon as it expires, you won't experience data loss at all. Microsoft doesn't provide a generous window before any permanent deletion.