EGR valve again!!!?

This thing is drivng me crazy. Just acquired Espace 2.2 and within 2 weeks of acqusition, I've spent so much.
Took it to Renault in Leicester for diagnosis, came out with EGR valve problem costing me £600 for repair. While repairing, Renault called to inform me the engine 'ran off' as soon as the valve was fixed. what is this supposed to mean!!!. I believe its not fair on users as a lot of money is expended getting this engines back on road. Renault should recall this product if they are not servicable. Still expecting the outcome of further diagnosis now as I've been rendered carless.
What do I do, where do I stand, whats the next step to take???