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Dear sir my xperia xa1 mobile is defective .so iwant to replace my mobile
Hi @ra32, welcome to our forum!
If you want to have your device replaced or repaired, you'll have to get in touch with your Local support team as we do not handle service cases here at our Global user based forum.
If you provide me with some information regarding the behaviour you are experiencing, I'll do my best to assist you! 
Touch doesn't work properly