I finally took it to the representatives. I was lucky enough to find that one friend of mine was working there and fortunately he called the engineer to come out and check it.
The engineer followed the common procedure as I have done , but he finally managed it to work.
What he has done that I didn't was that, after turning the ignition to the position two and then removing the key remote, he kept pressed the unlock button and then three times the lock button, but he has done it many times continuously. In all the instruction I found in the internet, the procedure was, turn the ignition to position two, remove the key remote, , keep pressed the unlock button and then three times the lock button and wait......
Just to know people, if you wait and nothing happens, try this : keep the unlock button pressed, and then 3 times the lock, and again and again very quickly.
Anyway, my real problem here is that there is no good signal reception from the car's receiver.
It might be the receiver or the key remote (might not transmitting high amplitute signals).
IF anyone has faced this problem, or if anyone has any idea about this plz reply.
I would like also to know where to find the signal receiver inside my car.