Mts — Getting threats form MTS

My MTS Number: [protected]. My email is [protected]@gmail.com. I had frequent disconnection issues from jan 10. I was writing mails from jan 10th till feb 9th. I have also raised 2 complaints jan/4821 and JAN/11362 via customer care. But both were closed without resolution. So in feb 8 i moved to tikona. I have checked my dongle usage for january, it showed 14gb in the dongle. in feb I just used donge rarely till 8th. I asked them to close the account. I didn't pay jan bill because, the dongle worked only till 10th jan. Rest of the days, the dongle was just a pain. I am ready to pay the bill for 14GB. As per their policy, if the user didn't pay bill by 16th, then the connection should be disconnected. To my surprise, I got a bill for feb. I was told by MTS that i used 29 gb in january and 18gb in february. As per the dongle usage details, I could see 14gb in jan and nearly 2 gb in feb. Also I never even connected the dongle in March. They are telling that i used 1GB in march. MTS is showing fake usage bills. Now I got a threat from MTS saying they will sue me for not paying jan and feb bill. When the internet is not working, they are not responding to my complaint.I am ready to pay for the half of january month even though it was working properly only till 10th. But I can't pay for february as the dongle never even worked. I have the mail chain where I tried contacting from jan 10th to feb 9th where my problem was not resolved and also few customer care executives call records.It would be great if anyone can give me suggestions about how to get out of the trouble. I can also prove them wrong with their usage calculations through my dongle usage history.