iPhone 11 Pro makes clicking sound when slightly twisted and mute switch is loose/springy.

My new iPhone 11 Pro which I’ve owned for about 3 weeks is now making a creaking sound whenever the phone is twisted. You might say ‘don’t twist it’ but this is noticeable when I take the case off and also slightly squeeze the phone on the side (for example when double pressing lock button for Apple Pay). Also I noticed that the mute switch is springy and ‘loose’ almost. Not the build quality I expected on a £1200 phone. What should I do? Im extremely unhappy and upset that I paid so much for a device that is not perfect. Thanks.