Sennheiser Momentum headphones

Sennheiser Momentum headphones. Over-ear, noise-cancelling, adjustable. Cord has push-buttons to adjust volume and play/pause. Plugs into traditional headphone jack. The plug is moveable/adjustable and when it moves the volume gets turned way way up…I’m not sure if this is some kind of wiring issue/repairable. Also includes case. Offers welcome! **Can’t ship until mid-January! Please reach out with any questions or comments :)