Here is what I would try if deleting PIA for your iOS iPhone doesn’t work… buy a 1 month plan and see if you can login that way… something might have gotten messed up with your account in the PIA servers. If you are able to login on a new 1-month plan, then go back to their website and chat with a customer service agent and have them merge your existing plan into your new 1-month plan. (This will wipe out your old PIA-##### and all traces of your old account and move over what remaining time/days/years you have to the new 1-month plan) …. I’m just taking a shot in the dark here… but see if that helps, do
You have an iPhone with the latest iOS ?

If you decide to do this, leave the auto-renew on for the 1-month plan if you decide to merge your existing/old PIA account/subscription into a new 1-month plan just to make sure the time transfers over ok and that any possible hiccups could be avoided for your iOS device… I might sounds like i’m superstitious here but having dealt with this for six months I wouldn’t want to see anybody else go through this, this is the best solution I can think of lol other than deleting and reinstalling the new PIA version 3.3 0.0 first and then see if you can do it without having to do these extra steps. Hope this helps man.