REQ Hungry Jack's app

[Scenex]

Name of Game: Hungry Jacks
Play Store Link (If it's a paid app, the apk): https://play.google.com/store/apps/details?id=com.webling.hungryjacks&feature=nav_result
Version if you know it: 1.1.3
What cheat? Health, xp, gold...: Bypass the time limit
Have you tried cheating this game? What happened?: Couldn't imagine a way to bypass the limit
Comments:

 

Hey, I live in Australia and Hungry Jack's is the fast food restaurant you all know as Burger King.

They published an app that gives out free food vouchers once every 10 hours.

Can you figure out a way to bypass that limit to get these vouchers endlessly? Perhaps even a way to choose a voucher?

 

I guess changing the phone time doesn't work and I couldn't edit the data/data files. The majority of these files is decrypted anyways.

 

Thanks!

 

Edit:
-Reinstalling app doesn't work, neither does clearing all data - > Time limit is server sided
-Other Facebook account doesn't work, so the time isn't linked to that.
How does the server know that the limit is on my phone? Could only imagine the mac address. Trying to change that one.