phone.replace() doesn't work, and when I try to return the phone it comes back undefined

class Pet {
    constructor(animal, age, breed, sound) {
      this.animal = animal;
      this.age = age;
      this.breed = breed;
      this.sound = sound;
    }

    get activity() {
    const today = new Date(); 
    const hour = today.getHours(); 

    if (hour > 8 && hour <=20) {
      return 'playing';
    } else {
      return 'sleeping';
    }

  }

    get location() {
    const today = new Date(); 
    const day = today.getDay(); 
    console.log(dayy);

    if (day == 0) {
      return 'outside';
    } else {
      return 'in the backyard';
    }

  }


    get owner() { 
    return this._owner;   
    }

    set owner(owner) { 
      this._owner = owner; 
    }


    speak() {
    console.log(this.sound);
  }


  }


class Owner {
    constructor (name, address) {
        this.name = name;
        this.address = address;
    }

    set phone(phone) {
        const phoneNumber = phone.replace(/[^\d]/g, '');
        this._phone = phoneNumber;
    }

    get phone() {
        return this._phone;
    }

}


const golden = new Pet('dog', 1, 'pug', 'bow wow');
const charm = new Pet('dog', 8, 'border collie' , 'woof woof');

golden.owner = new Owner('Isis', '123 main street');

golden.owner.phoneNumber = '(123) 456-7890';

console.log(golden.owner); 

console.log(golden.owner.name); 

console.log(golden.owner.phone);