how to have NK back

Hello everyone,

First of all I would like to excuse that I have to write in English.

I have been in Germany till 28.02.2005, but I have moved out after that.
My "Hausverwaltung" told me that I had to keep my bank account in Germany
at least for 1,5 years to have my "Mietnebenkosten" back, but I don't hear
anything from this "Hausverwaltung" anymore.

Now I am worried a little bit because they have also kept my "Kaution",
and I want to close my bank account in Germany as soon as possible
becouse it also costs.

Since my German is not good, it would be very helpful if someone could tell me
how to write quick letter in German to ask them when I could know about
my "Mietnebenkosten". I cannot write well, but I understand even if you tell me in German.

Thank you so much for your help.
Yours
Sakura