Venu, The MHRD has come up with a new schedule for JEE Mains, JEE Advanced and NEET 2020. JEE Main examination will be held between 1st-6th Sept, JEE advanced exam will be held on 27th Sept & NEET examination will be held on 13th Sept. If this holds true to the schedule, the admit cards might be released either during the 3rd or 4th weeks of August.  So it is too late even for contacting NTA. Please check if you have received any Confirmation mail from NTA regarding successful submission of your application form. If yes, then your application has been submitted. Or else, you need to remember whether you did not Click on "Confirm" during the registration or after using the Correction window. If it is during Registration, then unfortunately you will not receive Admit card. But if it is during the correction window, then the changes you made to the application form will  not be applied but you will get an admit card. Both ways, it is too late even for NTA to interfere.