Hi,
BSNL has changed their plan change policy.
What they say
When you apply for a plan change, it will take effect only from the succeeding month.
What will happen
May be you applied on 10th of March and normally expect to get the plan changed from April 1st.By this statement, BSNL only means that your plan will not be changed in March. They give you no guarantee that the plan change will effect from 1st.I have experienced it personally. Please check the screen shot for details.
Please think of some kind of personal confirmation.
I applied in Feb, expected to be changed on Mar 1st, instead they changed it on 5th. I talked to the Senior Divisional Engineer (SDE). He told me that not even your application date counts. It is when they feel comfortable.
They consider administrative department to work in Pakistan or something that they have no connection with it when we give the application there. For us both are BSNL but for them it is not.They charged me extra for the usage till 5th even without considering I changed to unlimited plan.
Please try as you say. As someone had in his signature, rely on Miracle. It happens sometimes.