that fired stupervisor was a bonafide company agent,,,,,file for bennies,explain to the adjudicator,they will probably ok you,
also,,,,,try complaining to the equal opportunity commission,,the company might be compelled to take you back,,,it is very common for companies that need to cut expenses often clean out experienced payroll folks,front office folks,hr benefits coordinators,whose loss
makes it hard on the remaining folks,,,,the unemployment folks should schedule a hearing among you,a company rep,and the state official.
as the guy you dealt with is no longer there,the company should lose,,,,and will then be liable to pay your benefits,,,register with the stat job service,search the net,etc etc
Honestly, it may be difficult for you to get unemployment since on the side of your employer, you abandoned your job as you did not communicate that you were extending your leave other than your boss who is already fired.
Usually, unemployment benefits are given to people who have lost their jobs through no fault of their own. You can always appeal if you apply for benefits and are denied and can present your evidence for your appeal or hearing. But that would take a long time, so make sure you get it started while job-hunting.