No-one seems to be answering, so try this
From: Mostafa Ghoreishi, B-PHARM student
To: Dr. X Y Z, Principal of SRIPMS
After graduating from SRIPMS with a B-Pharm, I applied for a master's degree from the same college.
Due to family problems, I will not be able to proceed with the course for several years.
I would, therefore, be most grateful if you could cancel the sit <<I don't know what a "sit" is>> and return my course fee.
I apologize for any inconvenience.
Regards (or Best regards [US] or Kind regards [UK] )
Mostafa Ghoreishi