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Depending on the spark plugs your dealership put in it could still be the spark plugs, especially if the tech assumed they were gapped properly and didn't check/regap to spec.
 

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For new plugs that have an unused crush washer in you need to torque them to 18 ft-lbs. If they have been pulled out and put back in you need about 20 ft-lbs because the crush washer won't keep the plug in place. When they are too loose two things happen - one is plug chirping. The other is poor electrical contact with the ground, which causes a weak spark resulting in a very quickly fouled plug. It sounds to me like you had one plug that fouled because your plugs weren't installed properly. If a Chevy service advisor is saying this is common I would shy away from that dealership. It's a sign the techs there don't torque the plugs properly.
 
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