Acharya Nagarjuna University — Not able to pay the fees

Sir I have registered my details for correspondence 1 year course for library ...while registering they have given application number ...but I haven't saved it...but now while paying fees it is asking application number...they haven't send to either mail.or phone number also...I tried again filling application freshly but not accepting as adhar number is already registered it is saying...pls do the needful