You will be ok with only 1 fax confirmation receipt if the Prosecutor themselves acknowledge receipt. Most should have notes of the date requests were made [it makes them look bad if they don't even know about requests in the cases the defence brings all proper documentation]. Bringing copies of the requests without receipts can help only marginally, as you do not have documentation to prove of their delivery.
Even one request, with receipt, should suffice for an adjournment. Especially if it was made within a reasonable time of the trial [say 6 weeks]. There is a chance the Crown will withdraw charge in these cases of non-disclosure. That will be up to them entirely.
When you arrive in court on the day of your trial, you should check in with the Prosecutor prior to entering the court room and ask for your disclosure package. This shows them you are aware of your rights to disclosure and they might not want to bother with adjourning the trial and opening up to a potential 11b motion. Be polite and don't insinuate anything.