I got my pgwp till the expiry date of my passport. then, I renewed my passport and applied for work permit extension in may, 2015. In mid of July I got my whole package back with a letter of explanation. That you did not pay $100 permit holder fee (as from Feb, 2015 they changed fee and added $100 more+processing fee). So, you need to pay that $100. Moreover, your work permit is already expired now, so you have to apply for implied status too and pay that fee too.
Then I applied again for work permit extension+implied status. They received application again on July 29. After that did not hear anything.
Anyone here with same timeline please update.