fault finding?

I HAVE A 1.5 DCI DIESEL KANGOO VAN. 53 REG
I WAS DRIVING ALONG AND THE ENGINE JUST STOPPED, A GARAGE DIAGNOSED FAULTY BLOW PLUGS, THEY WAS REPLACING STILL DIDN'T WORK, THEN THEY TESTED INJECTORS 3 WAS FOUND TO BE FAULTY, THEY WAS REPLACED IT STILL DIDN'T WORK, AT THE MOMENT I HAVE A BILL FOR AROUND £600 AND THE VAN STILL DOES NOT WORK. WHEN I BROKE DOWN THE AA MAN THOUGHT IT HAD AIR IN THE FUEL SYSTEM, HE BLEED IT, RUN ENGINE HE STOPPED THE ENGINE AND IT WOULD NOT START AGAIN, HE THOUGHT IT WAS PULLING AIR INTO THE SYSTEM.
IT SEEMS AS THOUGH I STILL HAVE SAME FAULT AND A HEFTY BILL TO PAY.
ANY IDEAS, BY THE WAY THE GARAGE HAS PASSED THE VAN ONTO ANOTHER GARAGE TO FIND THE FAULT..