HTC — I gave phone for service which is in warrenty they are asking to pay for it

Address:

Hyderabad, Andhra Pradesh

I have htc mobile which got some problem i gave that in one of their service centers they said that to give it another service center so i did it and in this service center they are asking me to pay for the service they are saying that some parts have to be replaced and they are saying that phone has been opened before it has been opened by the different service center of the same company