Not approving special sick leave

Working at Voltas limited-A TATA enterprise. I have suffered a knee ligament injury on 2nd June 2020. I gave an application on mail for special sick leave for 3 weeks with certificate from my doctor (form 4) and MRI scan report. My manager has not approved leave. Quoting his reply here- "Special leave is not permissible. He was asked to reach his official location on 26th May, but the communication from him only said that his e-pass got rejected and it seems no further step was taken towards his movement. However, owing to the restrictions of travel prevailed at that time, he can apply for leave from 26th to 3rd June, giving due consideration to the situation. And from 4th June onwards for the next 3 weeks (or may be more as he had mentioned) he shall apply leave w/o pay. Shall resume pay date from date of reaching location. Kindly communicate to him clearly on this matter. Requesting Mr. Karthik in copy of this mail to make note of this and suitably take it forward." Mr. Kartick is HR. Please give me appropriate response. Also, it is communicated that it is work from home period by corporate office and that order is not yet terminated and office is not yet open i.e. my locational office- New Delhi. But managers are forcing to go on work location in the time of pandemic.