I've seen people selling methods and even services for unlimiting/getting the funds out of limited paypals whos offering something like this?
Usually depends upon the type of limitation you have got, if your account is limited for usual 180 days than you have no choice than waiting for 180 days to get your funds back.
And another case could be your limitation on transaction volume as an unverified member have reached and you need to verify your account to increase this limitation, in this case i have also seen few people offering verification of your paypal account to increase your limitation however most of them may just scam you and run away with those limited funds. Don't know any particular service providers/thread to recommend you.