My iPod nano 7 headphone jack doesn't work

Hello,

I've had iPod nano, 7th generation for almost two years now and it worked fine until a couple of months ago. I believe the problem is the connection between my headphones and the jack. When I push them really hard it works, but as soon as I let go it either pauses or stops producing sound. Sometimes it does work when I let go, but stops at the slightest motion. I tried cleaning the jack, restarting the device - it didn't help. When I called the Apple store in my country they told me they couldn't fix it because Apple no longer produce spare parts. I cannot believe there is nothing I can do to make it work properly again. Please help.