When you think about how many vendors AdSense pays each month, it's extraordinary that they are able to pay the vast majority in a manner of days from the typical start date. I would think that AdSense is well within normal business practices to pay all vendors within 30 days of the typical due date. So, if you don't get your payment by the 21st of the following month (like July 21st), then maybe you'd have a valid complaint but until then, you're just a vendor waiting for your payment. That's it.
If you were a vendor for WalMart or the US Government, you'd be waiting 60 to 90 days before they would even allow you to question their payment schedule and even then, only acknowledge if you had an outstanding payment, not actually talk to you.
Feel lucky you're part of the AdSense system. If you don't like it and feel you're being in some way cheated, please by all means, find another ad broker.