Rails not recognizing phony_rails method

[eastsidedev]

Rails 4.1
Ruby 2.0
Windows 8.1

I am using the phony_rails gem

In module models/concerns/sanitizable.rb, I have:

module Sanitizable
  extend ActiveSupport::Concern

  included do
    before_save :sanitize_phones_and_email
  end

  def sanitize_phones_and_email
    (self.email = email.downcase) if attribute_present?("email")
    (self.work_phone = phony_normalize work_phone, :default_country_code => 'US') if attribute_present?("work_phone")
    (self.mobile_phone = phony_normalize mobile_phone, :default_country_code => 'US') if attribute_present?("mobile_phone")
    (self.fax_phone = phony_normalize fax_phone, :default_country_code => 'US') if attribute_present?("fax_phone")
    (self.other_phone = phony_normalize :other_phone, :default_country_code => 'US') if attribute_present?("other_phone")
  end
end

In models/agent.rb, I have the following:

class Agent < ActiveRecord::Base
  include Sanitizable

  validates :first, presence: true
  validates :last, presence: true

end

In controllers/agents_controller, I have the following:

def new
  @agent = Agent.new
end

def create
  @agent = Agent.new(agent_params)
  respond_to do |format|
    if @agent.save
      format.html { redirect_to @agent, notice: 'Agent was successfully created.' }
      format.json { render :show, status: :created, location: @agent }
    else
      format.html { render :new }
      format.json { render json: @agent.errors, status: :unprocessable_entity }
    end
  end
end

In my helpers/agent_helper.file, I have the following method:

def create_new_agent_manually(row)
  agent = Hash.new
  agent['first'] = row[1]
  agent['last'] = row[2]
  agent['work_phone'] = row[5]
  agent['mobile_phone'] = row[6]
  agent['fax_phone'] = row[7]
  agent['other_phone'] = row[8]
  agent['email'] = row[9]
  new_agent = Agent.create(agent)
end

When create_new_agent_manually gets called, I get the following error message:

undefined method `phony_normalize' for #<Agent:0x00000006fcbdd0>      

and it provides a line number that corresponds to this line in sanitizable.rb:

(self.work_phone = phony_normalize work_phone, :default_country_code => 'US') if attribute_present?("work_phone")

The reason I have the before_save action in this separate module, is that it's used by at least three separate models and I don't want to repeat myself. In my application, I am importing data from an XLS spreadsheet (that part is working fine), and passing each row to the methods above. Any ideas?

[joost]

Hi, I updated you comment to properly display code.
Please read the documentation. phony_normalize is a class method. If you want to do things yourself use PhonyRails.normalize_number.