Update: MH have finally responded to tell me that they are now investigating the issue. Only took me 3 tickets over several months to get this response.
Thank you for your correspondence with Malaysia Airlines.
With regards to the below query, kindly note that we have forwarded the
below matter to the respective department for further review and assistance
pertaining the system issue faced on the website. Once we receive an update,
we will then revert to you accordingly.
Hence we ask for your humble time and understanding.