MTS / Sistema Shyam TeleServices [SSTL] — Data card dongle [protected]

Address:600115
Website:mtsindia.in

I have been using the data card since 2014-15 with compromised quality and wrong usage bills. So i finally decided to cancel my service on jan 2016.
Some of reasons are:
-they brought down my data limit from 15gb to 12gb without notifying me.
-many times they have charged excess either in data or billing.
-outages were never fixed on time.
-no detail bills were given when asked on usages.
-after canceling they are asking to return the dongle which i was asked to pay rs.1000/-
-they took 5 days to cancel and sent a bill for rs.480. I told i am not liable for delay in their part.
Now they are sending me threatening emails/sms/phone calls in name of lawyers and goondas. It is causing lot of agony and mental sickness due to their approach. What can i do to avoid such harassment? I am looking to go file a police complaint on fraud and cheating and harassment.
Please help so i can respond to them.
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MTS / Sistema Shyam TeleServices [SSTL] customer support has been notified about the posted complaint.
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I have been using the data card since 2014-15 with compromised quality and wrong usage bills.
They brought down my data limit from 15GB to 12GB without notifying me.
Many times they have charged excess either in data or billing.
Outages were never fixed on time.
No detail bills were given when asked on usages. This is against policy.
So I finally decided to cancel my service on Jan 2016.
Canceled it on 31st Dec. But they took 5 days to cancel and sent a bill for Rs.480. I told i am not liable for that since I did not use the card.
Now they are sending me threatening emails/sms/phone calls in name of lawyers. It is causing lot of agony and mental sickness due to their approach.
What can I do to avoid such harassment? Please help so I can respond to them.
MTS dongle is not connected to y laptop when the peak time in ernakulam, Kerala and speed is killing my time. I complained to their customer care services and their approach was so bad, they tell me that they have no solution for this problem the only way to relocate my system.

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    MTS / Sistema Shyam TeleServices [SSTL] Phone
    +91 12 4481 2500 [Corp. Office]
    MTS / Sistema Shyam TeleServices [SSTL] Address
    MTS Towers 334, Udyog Vihar, Phase-IV, Gurgaon, Haryana, India - 122001
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