LG Electronics — Regarding "lg g8x review event" organized in smart world app

Sir
I have registered for LG g8x review event organized in LG smart world app and i have submitted my registration in that event as well
Now event was not showing in smart world
and LG revoke event before deadline
As per event if you review our phn in flipkart and register for event before 30th of Oct then LG will provide powerbank as a token of gratitude
And now after revoking with out any notice now i called customer care of LG and they were like that event was never existed and they don't have any details regarding this

Please help me
At least I must know reasons for revoking that event ryt as a registered person for that event

Smart world app was pre installed app in g8x mobile when we buy it

Attesting here screen shot of event which was now revoked

Thank you sir
Vineeth km