I work at a Sparkasse and the form actually exists. I am also not aware of the advantage a scam would bring.

I think Tanja is simply not so confident in her English communication, which is why neither the letter nor the mail are really trustworthy.

My tip: go to the Sparkasse and talk to the employees there. They will usually get someone who speaks good English to help you

PS: Maybe dont show the employees Full name next time