CRM notification not update

CRM not working properly as i have marked a follow up for payments from the client also i have mentioned date and time for the notifications but neither i received any notifications for the same via pop up on my mobile screen and neither on the system.

Please rectify this issue at the earliest

Hello Sir,

We will check and update you

Okay i am waiting how much time to take to clear this problem can you help me please

waiting for your update