I too have the same problem. eVAL amendment application needs to be sent to EMGS by university and upon confirmation and checking EMGS will forward the application to immigration department. However it takes time. I’m still waiting for the reply.
Please be informed that there is no specific time-frame for the VAL amendment process. The approval to amend the VAL is solely at the discretion of the Immigration Department. We will notify your institution once the VAL has been amended.