I bought an iphone 6 on instagram?

I bought an iphone 6 on instagram and it costs $150 yeah its pretty cheap! Thats why i planned to get one. I paid in thru western union, I gave the confirmation number to the seller on instagram, he said he's going to pick up the money first before he give me the tracking number. And then i message him again on instagram, he already blocked me. Then i realized I got scammed.

LESSON LEARNED! Don't buy anything on instagram!

What should I do?

This resource can direct you to some answers: https://www.westernunion.com/us/en/fraudawareness/fraud-question-and-answer.html… However, it is unlikely anything can be done. Just know for next time don't release your money until you confirm a tracking number (even then it may still be may be a fraudster).

File a police report but Western union payments are non refundable. Also report the profile to Instagram
Instagram is supposed to be only for sharing pictures. It's not an commerce site snd is never supposed to be used for buying and selling. If selling were allowed on Instagram it would be connected to PayPal for payments. It's not
Go file a police report but your money is gone