Idea Cellular — Zero internet speed for hours long

I would like to bring it to your notice that the internet connectivity of Idea Cellular is very poor. Despite hike in price by around 25% twice in last 3 years yet the internet speed degrades to zero anytime for 1-2 hours long abrupting my work.
So, I request to please look into this matter to ensure that internet speed never set to 0kb/s if one have enough recharge and data to used.

State: Bihar
PinCode: 844101