Quests section not working.

Its been more than 25 days my quests section is not working, tried every steps cleared app cache, restart my phone, checked my network, uninstall the game then install it, I tried every step and the issue is still there and there is no problem with my device, my device is up to date. I lost many rewards form quests that I can earn easily. 25 plus days, seriously. It is really frustrating. 

Added the attachment of my issue.