Has anyone already asked SunTrust what is now the span of each 1-month period? Is it the calendar month, because it definitely wasn't the 5th to the 4th this time?

I received around 1900 miles, under my $4000+ spending in a Balanced Banking account. Also, I had $6000+ in purchases on 7/23 that posted as 7/29 transactions. Being past the 7/25 date, they didn't appear in my August miles. However it seems they also didn't appear in my September miles. That late July period seems like a no-man's land. Thanks.