I've had the same issue. Competed 2 offers, tap joy says they were rewarded. I explain to them that i never received the gold, told me to send an email to GLU and gave me the address and what to send . haven't even received a "we got your email etc" it took a bit of time completing those game requirements and would like to get the gold promised. About 4k worth.
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https://communities.glu.com/tap-sports-baseball-2018/discussion/5447934/tapjoy-no-gold#latest