Do not provide internet service also after payment of bill.

I am paying internet service bill payment on friday 29/5/2015, They said me thad installation of modem done within 1 day but upto now they not install any hardware. And also when i am call to costomer care they tell me that they provide high priority to my complaint but they not respond, name of customer care executives are mukul, suresh ,darshana, and vipul ayyer are always said only to give high priority to my complaint but not done any work.
Also the regional service provider not answer the phone call done by me. Pls file case and give them strict warning otherwise take an action and provide me about the result on my complaint.