Unfortunately, fixed matches are real. In some leagues this problem still exist due to lower wages and corrupt football systems. Players, coaches and referees can still be bribed. Don’t try to find fixed matches online, as nobody will share such real information for small amounts of money. People who organize this criminal activity will hide it as much as possible.
Fixed match sellers online will always be a scam. They will sell you one random outcome and in case of a lucky win, they will sell you another random result etc.