trains – How to cancel a bahn card?

I asked to cancel my bahn card using this form. I currently live in the United States. Three weeks ago, I received an email stating that my request had been forwarded to the appropriate department and I will receive confirmation from them. I have not heard from them yet, but last week, I received another email (now in German), which asks me to evaluate the service I 'm receiving. I used recently (that is, canceling my card). I do not know if my card is canceled or not, how can I be confirmed about it? Should I do something else?

Thank you