Share your experience!
First. I don't know very well english.
I was buy Xperia A1 ultra mobile phone but it's have got touch sreen problem and I was send that four times to service but they wasn't do any thing!!! not change my phone not repair my phone, they just send back to my phone three times... No one help me about this subject. Sony Mobile Turkey is very bad and they doesn't think of customer. please help me about this subject.
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Hi @HasanAliGirgic, very sorry to hear about this. 
This is a Global user based forum and all service cases are handled by your Local support team, therefore I would recommend that you get in touch with them for further information on how to proceed with this matter.
They are the experts on your market and are very well informed when it comes to warranty, consumer laws and local service routines and will be able to provide you with a much more detailed than I will be able to do.
I hope that helps!
Jonas,
If so, then where can a Sony customer place an official complaint with Sony regarding how local Sony branches are handling phone repairs? This is outrageous! I am in the same boat as the original poster and have returned the phone to the Netherlands repair center a second time, after they have supposedly repaired the touch screen, but returned the phone to me with scuffs on the bottom back and a gap near the sim-tray???
I will definitely not recommend SONY Mobile to anyone I know, or hear them wanting to get a Sony phone.. EVER!
Hi @Kevin_Dimov, very sorry to hear about this and I apologize for the late reply. 
I'm afraid that I can only recommend that you get in touch with your Local support team and file a complaint, or ask if you can speak to a manager / someone that handles service cases.
This is due to me being located in a different market and all service cases are handled locally since the local service routines may vary between markets.
I hope that everything will work out for you!