SEP 11.0.6 upgrade to SEP 12.X

Hi,

 I'm Sathish (Pricol Ltd), Here we using SEP 11.0.6 a license version and Now we going upgrade SEP 12.x version. So, how can i get that version by using that license key.

Symantec Customer ID : 56460881

Contact ID : 465002046123133

Thanks & Regards

Sathish Kumar