Hi there @Patrycja1
You will need to contact O2 to process a claim (if you have got insurance)
They are on Social Media here:
Is this a current offer?
I had this reward about 2 years ago with a contract but I've not seen it advertised recently.
If you have it, it will show as a bolt on in your MyO2.
If you do and you wish to claim, you call customer services and they will arrange to replace your device with a refurbished one.