PROBLEM
How to delete quarantine files via command line for KAM (Malwarebytes)
SOLUTION
Running the following command will delete the quarantine files in the "Quarantine" tab of the Malwarebytes UI.
CD to
C:\Program Files (x86)\Malwarebytes' Anti-Malware\ - for 64 bit machines
or
C:\Program Files\Malwarebytes' Anti-Malware\ - for 32 bit machines
Then run
mbamapi /quarantine -delete all