Can anyone help, my work visa will run out on July 15 it is July 10!

However I started this processes 2 months ago and finally today my last employer (after several attempts) ( I also made several attempts to ask foreign affairs for help) finally received my cancellation letter and FEC! Can I still go to PSB ask for extension so that my new employer has time to get my documents prepared? Either that I have to start all over again! Feels very unfair