Moonstone RE5 hell

I wrote my RE5 with moonstone between 2017 and 2018 All the bookings, certifications were done and sent to my then employers email standardbank.. the bank had given us limited time to obtain this and I eventually passed after my 2nd time with moonstone. I have an interview lined up n requested I be sent my certificate copy as I no longer have access to the email address I used cause I no longer work there, I was told they can’t pick up my ID number. The lady never bothered asking my name, surname or even email address to maybe pick up my certificate using a different method as this is already over 6 years ago. It now looks like I’ve **** on my CV as I have absolutely no proof whatsoever that I indeed wrote and passed my exam . I need help please as this is messing with my job hunting