[Resolved]  Idea Cellular — billed for deactivated duration month

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Ideacellular

I was an active idea user from last 1 year with idea postpaid, whereas befire moving to abroad, i planned to deactivate my postpaid connection and switch to prepaid because my i wanted to keep my idea number active due to registered on various accounts. However i went to idea store for procedure where i cleared my outstanding balance with idea. And submitted my id cards for prepaid regustration of same number. I was informed that my current postpaid will be deactivated in 3 days, and as mentioned i got my number deactivated on mentioned date, and i had my prepaid sim card inserted in my phone and postpaid was of no use. Then i travelled overseas.
But when i enquired my family if prepaid number is active, it wasnt active. And after a month i got mail from idea asking for bill payment if next cycle month. I was confused that why should i pay when i completed all formalities for deactivation and cleared my outstanding balance. I dropped mail to customer care for same, but they responded after tooo long that my number was showing active so i will be charged. What is my mistake here and why should i pay for this cycle? By the mean time i got legal notice from idea with court for bill clarification. Now i am staying abroad, and i am really not understanding how could they charge my 1330 rs for deactivated period as my base plan was 444 rs and they say i used data so the bill went to 1330. I am like what the hell?? I didnt even had network coverage and my postpaid card was not even inserted in mobile phone, instead i was waiting for prepaid to get activated. But neither that happened.
This is ridiculous service and i dont know what to do now, and why to pay for the other period which is no used at all.