Postal Life Insurance [Pli] — premium paid but not received receipt number

I pay 4400/-rs. For my pli policy premium for period 1/1/2019 to 31/1/2019.in primium portal figure shows 4400/-rs. And paid portion shows 4303/-rs. Without gst. And also not shows receipt number. I paid pli premium many more times before but first time i have problem with this month primium paying.in bank messages amount of 4400/-rs. Pay to pli but receipt number is not displayed.