PSN code from ‘already redeemed’?

Posted 8th Jan 2020
Am I doing something wrong with these codes? I bought 2x 12 month PSN codes from in November for £30ish each.
I’ve just gone to try and use them tonight to top up their membership dates, and both codes say they are already redeemed.

Nobody at our end has had access to them except me, and they’ve definitely not been redeemed by anyone here. The expiry date on our account is still March 2020z Am I missing something?
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