Solutions to earphone jack distortion
Sounds like you need to do more cleaning.

Do not use metallic objects like needle.

Use toothpick.

Also use a ear-swab (with some alcohol).

Then see if you can get the sprig out in the proper position. 

It is probably stuck. That's the piece that holds the plug in place. 

You should see it when you look inside with flashlight and magnifier.