I m using this services from last 1 year and I think I m fully statisfied with them.
Speed of isp is great we never feel that internet going slow down.
Talking about its services and support, only one time I need help becuse of accidently changed router password and I forgote it. So just I called to help desk and within 10 min I got solution. So we can say its support is very strong.
Its connection relaibility is also good in mumbai not sure outside of mumbai.
Bottom line is D-Vois is great internet service provider in mumbai.