The next week, Chuka was fired from his job with a debt attached to his sack letter. He was to pay back the millions that had gone missing.

The error in the work done was missing transactions and figures were not adding up, not missing funds, so it makes no sense that he'll be fired and asked to pay back millions, unless more details are missing in this story. The first logical solution would be for the team to do a collective audit, and see what is missing, not immediately firing an employee and asking him to pay debts. That's not the solution. The story cannot show all things, but things happened too fast to be realistic.

Well, it's just a story, and a deviation from reality is expected. Fiction, it is, after all.