Sorry to here about the engine Johnniep.
Of all the 2.0L ts engines I've had I always felt that was the fastest strongest of them all. Hope you enjoyed the car since you've had it at least.
Unfortunately I would say you'd be wasting your time trying to fix it. The oil light comes on at 0.3 bar, so by the time you see that it's already too late. There will be wear in the bearings and the head.
As mentioned you could try replacing the big end shells, although in my experience they'll just go again. It depends on whether it has spun a shell or not. If the shells are just worn then replace them and hope there is no wear in the head.
If the shells have spun in the caps then forget it. The only way to tell is to take the sump off and have a look.
I'd be having a chat with whoever changed your oil as well!