Based on your post I take it that your headset cable is broken.
If the cable is broken by the headset, you may be able to get away with just shortening the cable, and re-soldering it inside the headset. Tho, make sure to take pictures and notes of which wire goes where. The wires used in headsets are usually very tiny and can be a bit tricky to solder.
Otherwise, you will have to open your headset and the controller pod, and note which cable goes where. Then you can de-solder the broken cable and solder on a new cable. Though, the solder pads on the circuit board can be a bit tricky to solder.
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