Does anyone have experience with doing this in germany?
Thanks for any answers
Thats not correct. Abmahnungen need to be actively dealt with. Ignoring them is not enough. While you do not necessarily need an attorney it is highly adviced to let someone write the letter for you.
Some random source for some infos: https://anwalts-atlas.de/was-passiert-wirklich-wenn-man-eine-abmahnung-ignorieren-sollte/