Talk to Accounts Office(commercial) in your Main telephone exchange of the city.
I am sure operator is not bound to return the over-charged amount as the plan you subscribe can remain unchanged however to attract more new
customers every company uses such marketing tricks.
However if they themselves relaxed your monthly payment i would only say its a good thing done already one should not ask refund from the date new plan was introduced
if you were so worried, you should have changed the plan when it was made available itself.
I am on night unlimited plan, however I'll be changing to Rs.750 one in a day or two itself, i will try it for a month and then switch back if it doesn't fits my usage needs.
I came to know of the change only after I saw this months bill. I went online and found the plans changed.
So I have to contact them, before I do I thought let me take some advice from here.
BSNL sucks here in Surat. They don't have a Junction box(DP). The line that is coming from underground cable is just a big bunch of open wires and then it goes over the terraces of a few houses and reaches my house. At my house also there is not junction box its just come directly through my window.
Its been one year and they are just refusing to put a junction box.
The worst service I have ever seen is BSNL. Its all good if you don't have any problems but if you have any problems you better either move to another place or change your ISP.