What is the ruling on the remaining amount from the physical therapy costs that the company paid to the employee, given that the employee did not complete all the therapy sessions and recovered before exhausting the amount?

If you are in need of treatment, you have the right to pursue it, even if you feel an improvement. However, if you are no longer in need of treatment, it is not permissible to continue it, as it is a waste of money and time and may cause harm. What is understood from the question is that the company provided the money solely for the purpose of treatment. If the treatment is no longer needed, the remaining amount must be returned to the company, because Islamic law indicates the obligation to adhere to the condition set by the donor. Returning the money to the company demonstrates honesty in dealings. If there is any embarrassment in directly returning it, it can be returned indirectly.