BSNL
Charged first five months Broadband Usage at a time

I, Smt. Minakshi Basak telephone no-03523261815, have been charged Rs-9568.00, the first five months Broadband Usage at a time. If I got the bill of the first month of Broadband Usage in the beginning of the second month then I should be concern and conscious about the use of internet (Broadband) because I have no idea about it.