MTS / Sistema Shyam TeleServices [SSTL] — want to disconnect my data card connection

Address:	600042
Website:	www.mtsindia.in

My mts data card number is [protected] in chennai circle. I don't have any internet connection from last few days. There is no response when i call companies customer care number. Even mts india website is not available. As per information presented on website, it is saying that sstl business has been acquired by rcom and customers can enjoy the network on rcom. Mts india outlet near my home is also closed now. There was no communication from mts for discontinuation or disruption in business.
I want to disconnect my mts wifi connection. But i am unable to speak with anyone in the company. Please help me to know how to disconnect the connection.