General ACCAWorkplace Mentor Troubles

Hi all, I have a bit of an odd problem with respect of my PER and wondered if anyone has experienced anything similar or could offer some guidance. I've finally finished all of the exams, the ethics module has been done and my per is written up but it is not signed off. In my last job i completed the PER but being the only employee in finance there was no one internally available to sign of the work i had done so i turned to our auditor. They agreed to sign it off and so i sent them the responses to the challenge questions for him to go over. That's the last i heard from them despite many attempts to get in contact. I have since changed jobs and but my new employer has no knowledge of my work except what i have told them. Can my new employer sign it off or do i need to redo my whole PER? What are my options? Any help given would be massively appreciated! :)