2004 Hyundai XG350 Q&A

2004 Hyundai XG350 Question: egr valve

I recntly bought this car and had the egr valve replaced and my check engine light still comes on what could be the problem? -
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A defective exhaust gas recirculation (EGR) switching valve may cause an intermittent rough or unstable idle engine.
A defective exhaust gas recirculation (EGR) switching valve may cause an intermittent rough or unstable idle engine.
The same shop checked the light and repaired and now it has come on for the 3rd time after just a few days of last repair. Am I being ripped off?