Hathway Cable & Datacom — slow speed

Address:	Chennai, Tamil Nadu, 600091
Website:	hathway.com

I signed up for hathway connection on september and i was getting quite good speed, like dl 7-12mbps, speed test nearly 90mbps. Recently, may be a month, i noticed slow downloads. I ran multiple speed tests, shows 12-30mbps. When i called customer care 10th of may 2018, they informed ld be sending technicians for inspection. Couple of guys came to my place by 8pm, they did something and said its an issue with the box on top of the building and ll have it checked the next day and left.
Next day when i called by 2:30, they said ll be there in an hour and did not turn up. Later i received an sms stating your request is resolved and it stand closed.
I called customer care again 12th of may 2018, asked the reason why the case is closed without my confirmation, they did not have a clue and was blaming the backend team. Raised a new ticket, after a day some guy came in, did same as the last technician did. Said they need to work on the laptop, i showed him the laptop, he said he's not trained in troubleshooting and ll receive a callback from another guy.
Some guy called me, said my laptop doesn't support 150mbps speed of wifi and can only have 90mbps speed using ethernet cable connection. I asked him, if that's the case, why i was having no problem with speed when i took connection. He said, its not possible to get that speed. Since the call was going no where, i disconnected the call.
Again, i called customer care, informing about the complaint and requesting for cancellation and refund. They said refund is not possible and ll have a technician over and fix the speed issue.
So far no resolution.