Employee's Providents Fund Organisation [EPFO] — Member passbook not getting updated on time

I have been checking the epfo site for my uan to get the exact balance of my epf amount. However, the passbook is showing the same amount since the last 5-6 months. The passbook has not been updated yet since dec 2016.
I tried sending sms to the number [protected] with the message as epfoho uan eng, but i got the reply showing the same account balance as displayed on the member passbook.
I really dont understand why it is taking so long for the epfo to update the member passbook to show the correct account balance.