MTS / Sistema Shyam TeleServices [SSTL] — mts dongle

Address:

Dehradun, Uttarakhand, 248001

Have already paid the bill till december for the internet connection registered with number [protected] but not receiving any services from mts. Tried to reach the helpline contact number but it says that number does not exist, even the local contact numbers registered are switched off.
Forget the refund i just want revke the connection because later i dont want get involved in any legal matter regarding bill payment.

In order to discontinue with mts services i need to get in touch with their support, which is looking extremely difficult because all the mode of contacts mentioned on their site are invalid.