It started charging me $408 hkd today

https://helpx.adobe.com/x-productkb/policy-pricing/subscription-price-increase-2023-individual-plans.html

@carolf42120030 

Most likely you had special pricing for the first year's subscription, then your plan continued for the second year at regular pricing. Did you use a Black Friday deal for new subscribers that can only be used once, for example?

I've moved your post to Account, Payment, & Plan. 

We can't see your account details, so if you have further questions, contact Adobe Customer Care directly.

Try the link to auto-open the Chat:
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Type "agent"

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