worst service of BROADBAND

Location/place: Bhiwandi/ Thane/ Mumbai

Name of company/service: MTS MBLAZE

Respected sir/ mam,
I am, mis suprriya pathari, hav purchased mblaze usb broadband connection of MTS. But since the date of purchase, I m not getting good network coverage. also not getting good speed.
Initially i complain in there customer care. they sent there technical person. he told me, there is network problem n he cant handle it. he will inform his seniors. then, i got call from company that, it will take 6 months to resolve thew problem, so we will give you refund.
but after that, they didnot contact me, and also they are not responding my call.
pls do the needful.
hoping for your good action.
Thanking you.