Thanks MerakiDave for the explanation from a support perspective.
Currently, I am able to glue (epoxy) the cracked part and can mount it normally but as we know glue is only a temporary solution which meant it always make me aware of the glue can last longer to hold the weight so it would be very good if I can change the housing.
I am looking for the 3rd party solution who can provide the outer case/ housing of MV21, please let me know if there is anyone willing to sell/ donate the MV21 that is broken/ non-functionally anymore.