iPhone 17 Pro Cosmic Orange Turned Pink.

You are not alone on this issue. Contact Apple again and escalate the issue to someone higher up than just a phone support tech and see what they will do for you.

https://appleinsider.com/articles/25/10/23/cosmic-orange-iphone-17-pros-color-changing-is-probably-not-the-owners-fault?fbclid=IwY2xjawNnuctleHRuA2FlbQIxMQABHvxTaM_qyGnkMEcP7o0UcTXF0eMOYcn1cUMjL7VbPVGrQIo7_cApg6hxo9PW_aem_TptUvqMdfq3ooHJwbh6jIw

Contact Apple for support & service.

Contact Apple Support - Apple Support

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"iPhone 17 Pro Cosmic Orange Turned Pink: iPhone 17 Pro Cosmic Orange turned Pink after few weeks of usage. Contacted Apple Support & Service center both refused to help by saying this is cosmetic damage which is not covered under Limited Warranty. I have not cleaned my phone with any chemical. I was just using it as normal person would do. What should I do now please help."

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Thank you for the photo.

Orange iPhone Turning Pink:

What you are reporting is a well known issue, likely of oxidization. No ne here on these forums has any call in replacements, whatsoever. These are just user-to-user forums. So, take this into for a Genius Bar Appointment at your local App Store. According to this post, Apple replaced it with an existing device, rather than a new one. So, maybe ask that participant bit more about how they successfully went through with this: Brand new iPhone 17 Pro turned pink instead of cosmic orange - Apple Community

Finding the Official Cost:

Take this in for a Genius Bar Appointment at your local Apple Store. Bring a proof pf purchase with you. There, it would be diagnosed, and you'd be provided with a cost.