The Free Gold offerwall is provided by our friends at TapJoy! 

If you need help with an offer, you can find their FAQ page here: https://tapjoy.helpshift.com/hc/en/3-offerwall/?hpn=1&han=1&p=ios 

To contact their team directly, you can sumbit a ticket here: https://tapjoy.helpshift.com/hc/en/3-offerwall/contact-us/?hpn=1&han=1&p=ios