It's been more than 3 years. Consider it lost. There's a very small chance you may get some back at some point in the future... if, and only if, that happens: consider it a windfall!

I don't think I've received a single litoshi of my frozen LTC.

See this page:

https://vircurex.com/welcome/ann_reserved.html

Look at the huge gap between the most recent payment (which was still 10 months ago), and second to last payment. Also note that the most recent payment only repaid 0.08% of the frozen LTC.