Onedrive LOSES my data!

So I spent time adding lots of entries to a stock management spreadsheet, saved it to my onedrive and made sure it said 'saved' at the top of the excel window. Opened the sheet again today to see that all of my changes are gone and I have effectively lost my stock because the absolute imbeciles at Microsoft can't code. How do I get my work back? When are microsoft going to sort their sloperating system out?