Originally Posted by
PointWeasel
Another datapoint.
This time it was the Turkish supervisor line in Istanbul that solved the minor issue that the Indian call centre was unable to process.
Indian call centre claimed 50EUR change fee due for a change PLUS 38EUR for a ticketing service fee as the change had to be paid in person at the near TK ticket office. RYFKM.
After HUCA twice, I got 'Sonny' who I asked directly as to where this mystery 38EUR fee came from as its not mentioned anywhere in my ticket fare rules nor on THY.com. Crickets. I finally got him to transfer me to the customer service line and she was a bit robotic but was able to process the 50EUR payment over the IVR and no further fee was required.
So...TK customer service continues to struggle and no thanks to the outsourced India call centre.

Sounds like the same thing I encountered a few years ago:
http://www.flyertalk.com/forum/24200853-post17.html
Afterwards I actually managed to find a mention of this fee on their homepage somewhere.