I was also falsely banned, I simply just uninstalled fortnite, went into registry edit (regedit) and found my hwid, you find it by going to HKEY_LOCAL_MACHINE, System, CurrentControlSet, IDConfigDB, Hardware Profiles, 0001 and edit the file called HWProfileGuid, change the last 3 digits of your hwid to whatever (i use 421). Once you've done that restart yourr computer and reinstall fortnite. Hopefully this helped it worked for me also sorry for long explanation