India Post — Unable to receive OTP for job application online

I m Unable to receive OTP for job application online for Indian post office GDS post. tried plenty of times, even restarted my mobile and check with others who can able to send and receiving messages there is no issue from network but INDIA POST SERVER not responding. Today is last date to apply. i was so much struggled to get required documents from government provided OBC kind of... now The server not responding proper to complete my procedure. i m literally getting mad. i dont know what to do. if there is any support from INDIA Post customer support anything available please help to complete it..