Hey prasadp,
>First:
Be cool man

& don't worry at all & every thing would be allright.
>Second:
If you have your own (tv or radio) then being a nice person we have to pay GEZ, because everyone pay that.
>Third:
If you don't want to pay then nobody can force you that you have to pay & nobody have permission to come into your home.

>Extra Information:
As you said that you have filledout the form
and send it to them. Well if you filled out that means you yourself said that you have TV or Radio. I don't know which option you crossed on the form and from which date? I hope that you don't said that you are here from e.g 2000 here in Germany and you have radio or TV, otherwise it would be very costly for you, because you have to pay from 2000 till 2009.
>Solution:
Check carefully what you written in the form of GEZ, dates and etc. If you are sure that you have to pay just for 3 months then after 3 months just get abmeldeformular GEZ from any Bank, and just send them by reasoning that you don't have TV or Radio.
Be Happy.....