Hands free problems?

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I have just bought a 2018 scenic, and initially the phone connection would drop in and out, but when it was connected a call could be made or received. Now, following the latest Apple update, the connection is perfect and never drops out, but is totally useless. If I answer or make a call, I cannot hear anyone on the other end, and they cannot hear me, even thought the call is connected and the seconds are counting by. Anyone else have the same issue?

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