Before 7 days ago my voip vsr provider increased the call rates for pakistan.
more info is here
http://stylosoft.com/pakistan_new_call_rates_increased/

please tell me is it true or not

Its true.
PAK is a worldwide increase.

There has been. SMB Wholesale rate is currently: 0.0452

Thanks All Guys. Now i have my own server... with cheapest rates.