Silly Alex

I received an email about a month ago saying I have yet to activate my french bank account that I opened in September 2010 and could I please activate it.  The fucking french!  Slow much?  You are a year late.  Anyways, before I left the country I made sure to close my account because it is virtually impossible to do so after you leave the country (made that mistake back in '09).  Things seemed to go smoothly, or as smoothly as anything goes in France and I thought I had successfully left the country this time (stupid).
Therefore, I was not expecting this email, however, I can't say that I was surprised.  Anyway I wrote my response and although I realized that the french wasn't great, I figured it was understandable.  I was about to send it when I realized my old french roommate was online so I might as well have him check it and make it sound more formal.  In English it would go something like
"Hello,
I don't live in Paris anymore, therefore I do not want a bank account with you anymore.  I thought I had already closed my account.  It would be great if you could close it.
Thank you for your help and understanding
Alex"

so I sent it to Antoine and told him I wasn't sure about the last sentence (excuse my french):

"Bonjour,
Je n'habite plus à Paris alors je ne veux plus un compte avec HSBC. J'ai pensé que j'avais déjà fermé mon compte. C'est bien si vous fermez-le.
Merci de votre aide et de votre comprehension.
Alexandra"

I cant figure out the last sentence

hahahha

c est bien si vous le fermez means it s cool if you shut up

Apparently I said "It would be great if you shut up" instead of "It would be great if you could close it" (in regards to the account).  I knew I had heard that expression before!  Thank god I didn't send it before talking to Antoine.