What should I do if my visa application was canceled due to a name spelling issue with a special character?

Hi all,

So, I applied for the DTV 6 days ago (German citizen). My last name has an ö in it, a letter only found in a few alphabets. It is common to either write it as “oe” or “o” on official documents. I have been getting flights by writing it with “o” for ages.

I just got an automated email saying my visa application was cancelled due to my last name having been incorrect. There was no indication on the application or embassy website on how to spell it.

I will obviously call the embassy tomorrow and if necessary the responsible office in Thailand… but I wanted to ask if anybody has had a similar experience and whether they managed to get a refund it were able to change it after the fact. My visa application just got moved to the completed tab with a “cancelled” indication. Didn’t receive anything but this automated email. Because loosing 350 Euros for writing my name correctly is not acceptable to me.