Mistake in Booking date

Dear Bahn De Team,

I have emailed to: fahrkartenservice@bahn.de
date: 4 August 2017 at 12:28
but have yet to receive a reply.

I made booking Order number: xxx on 2017-07-06.

To my surprise I have made a genuine mistake and booked this ticket for 28th July 2017, even though I was flying on 29th July 2017.

The train staff noticed my mistake and asked me to purchase a full priced new ticket for 41.50 Euro and suggested to contact Bahn.de by email.

I know this was my mistake, but would bahn.de be willing to refund one of the paid ticket? I have attached my flight booking as proof that this was a genuine mistake in my email.

Kind regards

Mr Tang

[Edit by editorial staff, 13/08/2017, 2:58 p.m.: personal data removed.]