need details about plan change

[manoj443]

hello all, recently 2 months back i have got bsnl broad connection with 500c plan(night unlimited) ,for this there is no need to pay one month security deposit and i havn't paid it too.but now i need to change my plan from 500c to ul 625 plan.should i have to pay security deposit now .if yes how much should i have to pay and if i have to pay security deposit can i redeem them in the next comming bill? plzzz clarify my doubtsthank you in advance