Yes indeedy it has happened and did -- it was my precious L/E Mobile Art red patent that the strap was totally a mess. It finally went to Paris where they made a new strap and it's fine but it took 9 months -- that's right 9 flipping months -- the time it takes to make a baby -- to get it fixed, not to mention a dumptruck of angst, phone calls, and finally giving up before Chanel agreed to send it to Paris.
So to your issue, either turn it in for another, if there is one, or take the refund, or be persistent as all get out and have a hell of a lot of patience with that determination. Wishing you the best, good luck in the fight.