New Daf XF phone issue

So our new XF’s came home a few weeks back. Thankfully they’re top of the range & are a decent enough truck as long as you don’t drive it in eco. Mine is going back into Dafs after Xmas not just for it’s 1st service but also the built in phone is playing up. From the very 1st day whoever I rang could hear me but all I could hear was a burring noise . On a couple of occasions it worked fine but for the majority it was useless. Any thoughts? Plus the radio also jams onto mute although the Sat Nav voice still works. Daf told me to remove phone fuse which cleared the mute issue & they say a software update at the next service will deal with that. But they’re stumped about the phone issue

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Take the fuse out and once its back in jobs a gudun, common fault

The phone update might take care of that buzzing.