[snip] Kindly let me know ,what should i do and how much it go na cost.I do not have any warranty .
The only way to do a proper trans diagnosis is to do it hands-on and with the proper tools.
Go to a transmission shop in or near T'rana and have them do the diag. It might be a simple adjustment, but you won't know until they have done the diag. Ask several friends which trans shop they trust.
On "flushing": unless trans service was done at the regualr recommended intervals since new, I do not recommend them as a service answer. You end up disturbing the buildup of particles that serve to maintan a seal with worn components, and you create more problems than you fix. It's too big a risk. Either do the service regularly, or don't do it.