Den Networks — No internet connection

Website:

www.denbroadband.in

I have den broadband connection and i am very disappointed because the connection speed is very slow.
Most of the time it shows that wifi is not connected to internet and when it does the speed is very slow.
I paid for 3 months for Rs2000 for 50mb/sec, but instead i am getting less than 5mb/sec.
I have also complained in den broadband customer care but i got mail from them stating my issue hhas been solved but it didn't.
Copy of the mail is attached with this.

I hope concerned authorities will look into this matter and try to solve it.