No you get charged if you don't cancel automatic renewal. On the xmb just go to account management, transaction management, services list and then choose PS plus and then hit cancel automatic renewal and your done. Do it after redeeming both codes. Try again.
my bad for the doubt.
got 2 months free.
![jawalrus :jawalrus: :jawalrus:](https://www.thecoli.com/styles/default/xenforo/smilies/jawalrus.png)