tl;dr: if you bought PS+ at a discount, upgrading will cost more to make up for that discount.
Absolute garbage.
Quote
About your inquiry about PlayStation Plus membership subscription price, thank you for your support. Since you purchased the PlayStation Plus membership at a discounted price at that time, after the new PlayStation Plus membership is launched there are two PlavStation Plus memberships that cannot enjoy other discounts:Sauce
1. PlayStation Plus membership bought with a discount.
2. PlayStation Plus membership redeemed with redemption code.
Therefore, if you need to upgrade to the second or third tier of premium membership, you need to make up for the difference in the previous discounted price first to return to the normal price. For example: the one-year PlayStation Plus membership was HK$308, the discount price was HK$187.6, and the difference was 120.4 X the number of remaining months, please rest assured, if you need to upgrade, the system will automatically calculate the amount that needs to be paid back for the difference.
Absolute garbage.