+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
i received test invite to appear on a day I thought I couldn’t make it because of work. So I sent a request to reschedule immediately after I received the invite.

Then I arranged with work so I can make it now. So half an hour later I sent another email informing them I will be able to attend.

Do you think they will just ignore the first email I sent or they will already have rescheduled before seeing my second email?

It will be good idea to call them.

Good Luck
 
At this point, I would send a snail mail letter to your local office also to clarify the confusion.