Your car should be still on warranty, call your dealer and let him to have that headache.
If you do not have warranty for your car. You have to remove the panel covering the belt assembly. Most likely you will have to replace it.
Put your seatbelt on. Should be an easy fix.
Once a seatbelt starts sticking its gonzo and needs to be replaced.
Check for a blown fuse.
There can be several things causing this. Take it to an auto trim shop.
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in ford f150 the u-jounts on the steering shaft get stuck. Use WD40 to help loosen them. Toyota camry's too!
rephrase that
To fix a seatbelt that won't pull out, make sure it is not twisted. Jerk on the belt gently and let it retract before trying to pull it out again.
A seat belt in a Saturn might be stuck because there is also something else stuck in the latch. Use a small pin or crochet hook to probe around the outside part of the latch. Once the seat belt is unlatched, clean it out with tweezers and spray both ends with WD-40.
To fix a seatbelt that won't click into the lock, first inspect the seatbelt and buckle for any visible obstructions or debris that might be preventing a proper connection. Clean both the buckle and seatbelt latch thoroughly. If the issue persists, check for any damage to the buckle or the seatbelt mechanism, and consider consulting a professional for repairs or replacements if necessary. Always prioritize safety when dealing with seatbelt issues.
I had the same problem and after a long time trying to fix I'V found that the wire harness in the drivers door was broken. Hope this helps you to look forward.