When I first reported this problem with my Doorbell 2 back in June, I noted that the ‘Chime’ audio was loud at the Doorbell but the audio from my phone was considerably muted. I have had 3 different replacement Doorbells (for a separate issue with Deco mesh access points) and all have performed identically in that the phone audio is so weak that it is inaudible to the caller unless there is zero background noise or the caller places their ear up against the Doorbell. I don’t hold out any hope for you unless they have sent you a product with new hardware or firmware that actually works.
I begrudingly paid my subscription knowing that this issue has persisted now for over 1 year.