Mts — Plan/Tariff details changed for my Postpaid Plan without informing me

Hi, I was using 999 (40 GB) plan [protected] and was satisfied with it. One fine day I started experiencing slow speed. First I thought it can happen sometime. Than I received message from strange no. +9110 that 15 GB limit was exhausted. Now first thing is there was no mention of my MTS no. or even MTS company name in message. How the hell could anyone understand that message is from MTS and for which MTS data card. Initially I thought message is from Airtel. Pure stupidity and shows how unprofessional they are. Secondly and more important part is that they changed my plan from 40GB to 15GBday+15GBnight without informing me. They didn't even had the courtesy to send me an SMS. I think that's also illegal. At the time of buying your data card, your executive said that this plan will never change for the older/existing subscribers. You guys are liars that is why you are not growing in comparison with other networks.

How can you change any plan your self without intimating your subscriber. I have never seen any operator changing plan for existing customer and that to without intimating subscriber. Even if one has to change, one only discontinues with the plan and comes out with a new plan for "New Customers", they never change plan for the "Existing Customers".

Please do not change my plan and keep it 40 GB without Day/Night factor. If this will not be there, I will not pay the last pending bill. I believe they just want to close the connection who have older and more beneficial plans.Guys beware of this company.