Den boomband is the worst ISP I ever used.
I used den boom and for 3 months, as I chosen 20mbps plan and I am getting speed between 1-2mbps I contacted to their customer support then after 2 days one person come to my house to check the problem and he said sir maximum speed 2.5 mbps hi milegi then asked them what's the matter of 20mbps, then he told no one gets 20mbps. They are making fake promises to attract customers to get trapped in their fake advertisements and fake promises.