MTS / Sistema Shyam TeleServices [SSTL] — Mts dongle - complaint closed but not resolved

Address:	Jaipur, Rajasthan, 302016
Website:	mtsindia.in

I have complained 2 times but my complain has closed automatically without resolving that i m having poor connection and speed but when i was purchasing mts agreed to give excellent speed on their dongle but speed is not coming of thats 1/3 part ...
now have stop using the dongle from 3 months, everyday the customer care calls says u have new offer and etc. but i rejected them but i was frustrated from the calls and get recharged my mts dongle for rs. 499 but the problem still didn't resolved and i have called customer care and every time they say that your problem has been resolved but it still continues...