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I was shown that when in a call its a separate volume control just for the call. When making or answering a call try adjusting volume on steering wheel left scroll wheel. It worked for me. Tesla mobile service showed me this.
Had Tesla mobile service round for this problem. I was being a muppet. Once in the call the volume control on the steering wheel was turned right down. Its a seperate volume control when in a call. Hope this may help someone.
I Bought the brushed titanium finish for centre console from Abstract Ocean and also contacted them about one for the dash as well, to match. They did it for me as a custom order.