Can my supervisor lay me off over the phone?

It was a Monday that I had requested to take off work. I received a voice mail from my supervisor that said " don't come in tomorrow, you can pick up your last check in 3 days". I had no warning, no idea that this was going to happen. And so I called to see if I could get a real answer why. First I was told " we are getting slow so we are laying people off" and after I said " if your laying people off then why did you just hire 2 people?" Then I was told " oh um well I guess you just weren't working out but your check is ready you don't have to wait to pick it up" then when I went to get my check and my personal stuff when I asked a few employees I work with what happened some said " they told me you quit" and others said " I heard the owner saw you take 2 long restroom breaks the last day you were here and he felt they were too long so they fired you". Also when I picked up my check, the lady in the office told me " your getting laid off so you can collect unemployment" which I have been unable to do so far and it's been almost 3 months.