Your target is very much achievable and also you are right, people trust more PSU than their Private brotheren.
Although PSU Customer Service is not okay, but their billing transparent, whereas, private players have none, neither Customer Service nor transparency.
Therefore, we have no choice than to rely PSU and PSUs have opportunity to grab as much connections as they can.
You say in PSU, billing is transparent. Let me tell you something. BSNL does not show the local numbers called, in their monthly bill. Is this transparency? Almost all the private players are transparent in billing..No doubt they do have indirect charges..