> Unfortunately and others can correct me believe it would be the same condition as getting a new card which can only be applied for from within Canada not from outside.
Correct
If you can, get your passport and PR back, no one can retain those documents and as someone suggested, right course might be to hire a family lawyer/seek police assistance.
If that is not feasible, alternative approach would require you to go through a stolen passport process and then get a PRTD on it to come back in Canada and then apply for stolen PR card process.
Any remnants of your past relation on passport/PR will have no legal implication.