That sounds correct, rewards are based on status at begining of the month, so for August purchases you will get nothing back as your did not have any status end on July. For September purchases you should get something back, but it will be based on status at the end of August and seeing that you have only been with then for half a month ( at the end of August) it will not be a lot. Rewards for September purchases have not been paid/allocated, thus should happen next week.
It takes a while for everything to sort itself out.
Thanks, makes sense (I knew I should have come straight here for the answers).