University Of Madras — I'm complaining about the irresponsible staff

I'm a B.com correspondence A23 Batch Student. Few weeks before, I went to the college which is under Madras University for to collect my 1st sem books & they informed me to pay exam fees by next week and told that, the details regarding to the exam also will inform in Whatsapp group. It's almost more than 3 weeks but Still not even a single message in that Group. So I called the staff to ask about the exam details but he harshly respond me and cut the call. This not a right way to respond students. I humbly request the management to take a serious action against those irresponsible staff & make a official information regarding semester exams.