Answered question

Official statement from Fizz when I contacted them via e-mail:

 

"Hello Emre, 


Thank you for reporting this issue. 

The correct information is the one that appears on our [main] website, every upgrade is valid for two years from the date you apply it.  I will forward a ticket to the specialized team in order to solve this situation. 

Following the resolution, you will be contacted via e-mail at the address *********@********.com

Have a nice day. 

Ionut"

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Just think about it though, if you stay with them for a two year period you will have plenty of time to level up and earn better rewards long before these ever expire.

Marc
Marc

Marc

User level
Level
2
1085 / 2000
points

On the web site, they state that the upgrades are permanent, but who knows, they can change the rules later.