Updated again
Support supervisor told me
If your Playstation plus subscription expires for more than 24 hours you will lose access to all previous free plus content permanently.
Nothing they can do, he doesn't know why anyone told me otherwise.
I'm sorry you are dealing with idiots. Mine expired like July 7th or something and I just never bothered with updating it (I had two codes for two years worth) until sometime last week I think.
So judging by the date on your original post mine expired after yours, was left unsubscribed longer than yours, and all my games work (well at least one of them does... Trine 2 on PS4. I haven't tried opening any others). Just tried opening a few on my Vita to test and they all seem to work too. And I know it wasn't letting me in them before I re subscribed cause I got reminded I needed to do that when I tried to open up GTA: Tales of Liberty City on my Vita (Which works now. Trine I also tried after it expired and that's how I learned it was expired but I wasn't in a hurry to play it so I didn't get around to it).
It sounds like you have people who don't really know, have decided it's too hard figuring it out, and so they're trying to tell you it can't be done in hopes that you go away.
Unfortunately, if you've already kept asking to talk to some one else and they all say no, I would agree that the best thing to do is take it to the media and be pretty loud mouthed about this. Let everyone on FB know, post on the Playstation forums, post anywhere they can see you posting (twitter and @yosp and other people known to be attached to Playstation). Make comments in the Playstation FB group and G+ group (and try to do it in the official one if there is one). See if you can't get some article out about how bad your CS experience has been. Pretty much be as loud as you can about the matter and try to make it so they can hear you being loud (so they know you are sharing your horrendous experience with everyone).
And this is why I don't like PS Plus. It basically requires a lifetime subscription if you want sustained access to all of the content you are paying for.
No it doesn't. It does prove that Sony's CS when something goes wrong is totally ridiculous (and honestly, not the first time I've heard horror stories of how useless their CS is when something doesn't work like it should).
Edit: Ok, I read that as you having to make sure your PS+ account never expires. If you mean that if you want to play the game you have to have PS+, yeah, it does work that way. But you are supposed to be able to let it expire and have the games again when you feel like subscribing again. I never would have tried it if that wasn't the case. And I'd probably stop using it if Sony changed it. I don't mind it being a Netflix like service but I would mind them saying I have to never let it expire if I want to keep having access to the games I've acquired access to through PS+.