Checks are cut the end of the month following the shop meaning this payment should have been mailed the first week in May. I've never noticed them being this late before. Is it Mystery Shoppers inc or Mystery Shopper Services? Mystery Shopper Services pays 45 to 50 business days after a shop is approved. Approval can easily take a week so 5/29 for a 3/2 shop is par for the course.
Equal rights for others does not mean fewer rights for you. It's not pie.
"I prefer someone who burns the flag and then wraps themselves up in the Constitution over someone who burns the Constitution and then wraps themselves up in the flag." -Molly Ivins
Never try to teach a pig to sing. It's a waste of your time and it really annoys the pig.
The last shop I did for them was mid-November. I received payment January 12. That's a similar timeframe to my history with them. Do you have any reason to believe the check was delivered by mistake to a neighbor, who let it sit on the table a couple of weeks, before putting it in your box? That has happened to me.
If telephoning didn't work, you may have better luck emailing your scheduler.