I did the same as you... I had to do a few hours of research, and I downloaded XS++ and the firmware I needed. The firmware was not easy to find, but in the end I found a torrent with all SE firmwares.
This fixed my phone, and it now works perfectly.
I would never again use wotan, or any other service of that type, and I would not recommend anyone buying credits from them. Instead, just use wotan to find out which firmware you need for your phone, download it from the torrent, and then just use XS++ to flash the firmware to your phone. Easy once you know how it's done. Good luck all.
I finally got my credit, not that I need it anymore. It took more than one week from the day I wrote the ticket until they responded. Bad service, don't use them.