So I think you and I got accepted on the same day. My deadline to accept is June 9th also. I had a similar concern (I haven't received my admissions package in the mail yet at all) so I e-mailed [email protected]
on May 25 and received this response:
The deadline to pay the deposit will be on June 9th.
The best way to pay your deposit is via online banking. You simply log on your bank account, add the University of Ottawa as a payee and use your student number as the account number. Once paid, you send a proof of payment (printscreen of the transaction) to [email protected]
I'm wondering if maybe they use a generic template for all of the acceptance letters that says the deposit is due June 1st? Anyways either way I think you're fine