You should never send any money to the person off site because it is impossible to prove that you settled the disputes unless the person willingly accepts it. Two years seems to be a huge time and if your account flagged due to dispute with a trader then it could be resolved in days. I guess your account was frozen due to Money laundering or auch kind of stuffs I guess.

LBC support is slow but they are quite responsible between resolving the disputes which I experienced personally so you should asked the reason for holding funds as first query.