Attached is the story, I've censored some vulgar words and swearing 

My car is a 1998 Kancil btw, 850cc manual.
Some facts :
1. I've changed my timing belt at 120k km, when the belt snaps it was 160k km. Weird, coz my timing belt should last for 80k km - how come it snapped after running for 40k km?
2. Once the timing belt snaps (heard kalak kalak sound), I straight turn off engine and rolled into a workshop 2 shops away from my grandma place, so didn't overhaul.
3. When the mechanic fixing, I saw that he is not so experienced in changing timing belt. He even asked some friends to come and see, and help, but they all also dunno how to fix. Then one of his friend come and use sandpaper to rub the tensioner bearings (I googled it up) middle part, then forcefully stuck it in.
4. Mechanic started it up, I was in front of the car. Saw the part where the fan, valve, engine part went senget.

And so, I googled again :
If you allowed the timing to become misaligned while you changed the belt, you have a serious problem on your hands. Either correct the error, or consult a mechanic. Do not operate a vehicle with incorrect timing, as serious internal engine damage could occur. (source)

If this is what happened to my car, I wonder what parts are spoilt.

I have sent my car to the workshop 3 times today to get my car fixed :
First time : After he fixed the senget part and returned the car to me, my car easily died when I was idle. So I returned the car to him.
Second time : After he fixed the "died when idle" problem, I took back the car. But it's very shaky, as if I can see two steerings when I was driving  So I returned to him and ask him to check on the mounting.
Third time : Engine oil leaking  Sent back to fix. Just got it back yesterday and haven't bring it out for a long journey test drive.

So my question to sifu sifu here : Are there anything else that I missed out and haven't check? My car is still shaky and no power. I have to use gear 2 to naik the same bukit which I always use gear 4 to naik.

P/S : Idle RPM at 1k.