Rewarding work - Lead Therapist Verbal Beginnings Employee Review

I was fired promptly after asking how the company planned to pay people who could not come to work from having COVID, during a virtual town-hall. I was an amazing therapist and worked very hard at my job. I was often recognized for that with great reviews and frequent promotions. The one time I spoke up and advocated for myself, I was let go. I had already put in three weeks notice so I guess they didn’t feel bad letting me go. Their official reasoning for letting me go was “company policy is to give 4 weeks notice when leaving” and that was their way of justifying what they did to me.