I am using dna isp from last 2 years. Here I will share my personal experiences.
I started by taking a plan which offers 1 mbps speed for 1 month for INR 531.internet speed is quite good. They have their own app known as dna infotel from there you can select a plan and pay instantly. During monsoon there was certain problems in Connection. I launched a complain through mail. They compensated me for the loss I have bared. customer service is good.whenever I called customer service reply from them was satisfactory. Considering connectivity, service, offers I was quite happy to use their services.