Share your experience!
I have filled an return form but I'm unable to valid it , Each time , web site say , that "an error has occured , try again" but i always get the same message .
I'Ve tried using my phone or my computer but same issue ! doesn't work !
Sorry to hear this, you could try contacting Xperia care live chat http://www.sonymobile.com/global-en/support/contact-us/
chat in France/ français 
Du lundi au vendredi : 08:00 - 18:00
Samedi : 09.30 - 18.00
Hi,
There was some downtime for Xperia Care yesterday, but it should be up and running now. If you still are unable to proceed, you would do best by following Thommos suggestion by contacting your local support team for further assistance in this matter.