After a long research I opted for ABC Broadband Broadband Services (as the speedtest.net results were marking the average speed at 2nd position in Ahmedabad). The Internet Service is pretty good as there are many plans to choose from and you can also lease WIFI access point.
But the main issue with ABC Broadband is you will not get the speed what you are paying for. (i.e. I am paying for 1024kbps and the average speed I am getting is around 450-500kbps) And one more major issue is you have to keep track of your complaints, other wise they will be closed without your confirmation and your problem never gets solved.
Finally i’ll give 6.5/10 to ABC Broadband.