Had my cam chain done but...

[His Dudeness]

My engine is ruined isn't it?
In reality?

The engine's not ruined but the casing is probably beyond economical repair. If the rest of the engine is in good working order then it's probably worth rebuilding it with a good casing. You could buy another engine to keep you going for now and rebuild the original then swap the rebuilt one back in and sell the spare one. If it was me I'd rebuild it but that'd be as much to learn how it all goes together as it would be for fixing it so I suppose it depends on whether you want to put the time and hassle into it and buy the few specialist tools needed to do it or not.