I applied for Naturalization 17 March 2020 online, and received msg as below. when checked today, Any suggestion what should be done?? is any one getting the same?

N-400
Your application has not been submitted. Although we have received your payment, you or your representative needs to call USCIS at 1 (800) 375-5283 in order to finish submitting your application.
Status
We could not complete your submission.