Mts — Non confirmation of Mobile Number

I have never registered for MTS dongle or any of their services my entire life. I got a call 3 months ago to confirm MTS number. I said I never registered and told them to cancel if anyone has used the number. Apparently these have failed to do that because I started getting messages from MTS on my mobile regarding balance every since. After a month the data usage messages became more frequent and annoying. I went to the MTS customer care in my city and they made me wait for over 30 minutes after which the in charge there met me and I explained the situation to him. i showed him my ID and told clearly that I am not this Syed person that your have registered my number with. He said very well I will look into it (but he hasn't clearly). Two week ago I get a message "Your MTS connection is disconnected. Pls pay ur bill of Rs. 935 at any MTS store or any Bangalore outlet". Last week I'm on a business trip and I get a call during my travel. This guy says "were calling from MTS. When are you going to pay the bill sir". I say "When are you guys going to take my complaint that you've got the wrong number?" and he is like "Sir don't joke we know its you". I'm totally freaked out that this guy bothered to call me and disturb me. For nearly 5 minutes I tried explaining that he has the wrong number and he kept insisting that he is right. Its highly disturbing esp. during my business trips. Now he calls me when I'm taking a break at work and starts annoying me again from a land line number. I tell him again that he has the wrong number but he says no. I am really furious that MTS bothered to register my number without confirmation. Is there any way that I could perhaps sue them for misconduct and creating annoyance or the lack of procedure to confirm customers? I have my own self's proof and number is also listed at my service provider as registered under my name and my name is clearly NOT this Syed.