Proper Part for iPod MC297LL?

My iPod classic 160GB earphone jack got bent to the point that audio only came out on one earphone. I gave it to a electronics repair shop and they replaced the audio jack cable but could not get audio to work and now it sounds like static and when you pressure the jack to the left the audio improves greatly. I was wondering if since I got model number MC297LL they got the thin or thick audio jack confused and installed the wrong one. I also was wondering if the right parts can be got since they appeared to be out last time I checked here. If I could get the right part for 15 dollars I might try to get it back up because it would save me hundreds of dollars.

-Thanks