What can I do if my physical therapist schedules next week’s visits without asking?

Today after PT my therapist had already put me in for certain days and times for next week. He handed me the schedule for the day. I told him I couldn’t make it on Friday and need to schedule it for another day. Not looking at others schedules in the computer he says it’s all booked. I asked to see another therapists that had availability and he said they are all booked too.

What can I do if my physical therapist schedules next week’s visits without asking?
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