Bolero / Apple problem

Hello all

Minor but annoying problem. Recently started using Apple Car Play through the Bolero unit in my Karoq - mainly to use Waze app and it all works pretty well. My problem is if using phone it shows a voice mail message and I cannot clear it. It is NOT on the phone and if I check voice mail I from the phone it is not there but it is stored somehow in the Bolero unit - anyone know how to clear it? I don’t want to reset everything if can avoid.

Thanks in anticipation

Grumpy