Hate to say it, but I'd get your car back NOW finished or not. The longer the process goes on, the less likely it will get completed correctly, or ever.
Guys like this will try to keep asking for more $$$, and stalling, and saying this is bad...blah blah blah
Throwing new bearings in a worn out engine is a band aid, and it'll only last so long (If @ all).
Tossing new bearings to remedy a rod knock is a recipe for failure.
There is zero substitute for doing a crank and bearings correctly.
It's knocking for a reason, and when they're knocking the crank needs work.
This means refinishing the crankshaft @ a machine shop. Then you potentially still have the rest of the worn out engine to deal with.
I would NOT pay another cent, in fact I would start asking for money back, and a LOT of money back, like in a FULL refund. The other issue is you paid up front, NEVER pay up front, and NEVER in cash.
Try to be nice, but stand your ground and be FIRM, no more deals, no more extra $$$.
You agreed to a price for a job, doesn't matter if things happened to him, or he got bad parts, that is NOT your problem.
Hate to say it, but it sounds like you're heading to small claims court in the near future.
Be it bad luck or someone trying to sell you the moon, with only paying for a star, it isn't going to end well.
'94 Caprice Wagon - Bilstein shocks, Hotchkis rear trailing arms & sway bars, Moog 80098/CC623 springs, AR Torq Thrust II wheels w/ 255/50/17 tires, Bonneville seats, and a LOT of new parts. Some day it'll be done...to do Jegs Catback exhaust & 24x conversion