I got my voucher for the 30 day free membership for Plus.
When i tried to use my code in Redeem Codes, it tells me that "The code you entered may not be correct or may no longer be valid"
And yes i've checked that i wrote it correctly, with small letters,big letters, with - and without it.
Did i get a wrong code in my email or whats the problem??
If your voucher codes are coming up as invalid or already used you should contact PlayStation Support for further assistance.
They will be able to see what the issue with the code is.