faulty Sony phone

Follow up on previous report. Once again i am disgusted with Vodacom. 10th March 2016 i collected my faulty phone but once again they ignored my email request to not repair my phone. They did repair my phone with a software upgrade again and said that my phone is not faulty and they wont replace it with a new one. My glass protection screen was not damaged when i sent my phone in. It came back with bubbles, small chips and two cracks on the protection screen. Looks like they dropped my phone. Vodacom person phoned me icw my previous complaint and told me that he will send an email to the manager at repair centre head office about my complaint. Up till now i have not received any feed back from Vodacom. This is not on, they are refusing to replace my phone. Who can i contact at Sony about this?