have you been called for aptitude test?
No.
Those who haven't received calls yet, don't lose hope... I know of an instance when a candidate was called after his given "time limit" had long expired. The one week time limit expires tomorrow anyway, so there is still time.
Are you sure they dont send candidates any rejection email?
As such, unsuccessful candidates do not receive any rejection e-mails, so they can be invited to attend further stages of the assessment, even after their projected "time limit". However if you do end up getting rejected, you get an official rejection letter around one month after your last interview/test.