2016 Dodge Dart

What is your question?

My son unplugged a headlight and plugged it back because he was going to change it. After that the car won’t start. We checked all of the fuses and AAA came out and tested the battery and it’s testing perfect ( it’s a fairly new battery). When we try to start the car it clicks once only and all of the electronics come on. I read online and it said try a new starter relay but no shops around here carry one for this car. A local shop said we need a whole new starter and a new battery which doesn’t make sense to us. Anyone have any suggestions on what we can try?