Again…I can’t think of a possible reason why would a ‘client’ buy any song if they don’t think its five stars?
They are both similar to Mick Jagger and Lenny Kravitz “God gave me everything” but faster:
I wouldn’t call it “rip-off” , that’s quite common a progression and claps and strong drums are almost must on audiojungle. Also he has more development later on I think. But he must have heard your song and it stuck to his ears somehow. But I think you would be happier following “Plagiarism is the greatest form of flattery” attitude than “rip-off” approach.
Will he be payed on 15th ? Now that’s a tricky question isn’t it