[Resolved]  Tata Indicom {Motorola} — phone locked

Sir,
I was using a motorala phone with tata sim since three years. when the condition of the battery had started going bad i thought to replace with new phone. So i purchased a new tata indicom{huawei}
that time i dont know about the sim they had given when i came at home i changed the sim of the two phones but the motorola phone has not started due to sim problem i forgot the matter because i had to go out of station i started the using the new phone with old sim. But now the problem is that the old phone is showing phone locked contact service centre.
I went to tata indicom hub they told me to contact the service centre of L.G and MOTOROLA at bistupur, JAMSHEDPUR, where they will take 80/- Rs and change the software and the new sim can also be started, Now the problem started the person(propriter) is not a good person he use to argue with everybody he is asking 165/- to open the lock. and for software changing another 225/- Rs it is quite ridiculous all of the tata indicom phone seller told it will cost hardly 80/- to change the new software and there is no charge to unlock the phone.

My question is what is my fault the phone locked by itself what will be responsible for this and why the customer is going to suffer.
please help me i want answer from your side