Form Not Displaying Errors

Not sure why but my form is not displaying errors. One of the first
parts of my method is to check for errors and display them before
processing the credit card. It just skips that part regardless of
errors or not and tries to process the credit card.

def signup_unlimited
@user = User.new
end

def signup_unlimited_create
User.transaction do
@user = User.new(params[:user])
@user.account_type = “Unlimited”
@user.login = @user.email
@number = params[:card_number]
@month = params[:card_expiration_month]
@year = params[:card_expiration_year]
@type = params[:card_type]

  gateway = ActiveMerchant::Billing::BraintreeGateway.new({
      :login => 'btdemo',
      :password => 'btdemo123'
  })

  if @user.errors.empty?
    if @number != "" and @month != "" and @year != "" and @type !=

“”
@card =
ActiveMerchant::Billing::CreditCard.new(:first_name =>
@user.first_name,
:last_name => @user.last_name,
:number => params[:card_number],
:month => params[:card_expiration_month],
:year => params[:card_expiration_year],
:type => params[:card_type])

        @amount = 430.50

        @options = { :store => true, :order_id => "1212451" }
        response = gateway.authorize(@amount, @card,

@options)

        if @card.id != nil
          self.current_user = @user
          @user.credit_card_id =

response.params[“customer_vault_id”]
end

        if @user.credit_card_id != nil
          @user.save
          @invoice = Invoice.new(params[:invoice])
          @invoice.amount = "9.95"
          @invoice.due_date = Date.today + 30
          @invoice.generated_date = Date.today
          @invoice.status = "Due"
          @invoice.user_id =  @user.id
          @invoice.save
          self.current_user = @user
          flash[:notice] = "Thanks for signing up"
          redirect_to :action => 'index'
        end

        if @user.credit_card_id == nil
          flash[:notice] = "Please verify your credit card

information below."
render :action => ‘signup_unlimited’
end
else
flash[:notice] = “Please fill out all the necessary billing
information.”
render :action => ‘signup_unlimited’
end
else
flash[:notice] = “errors with your user form”
render :action => ‘signup_unlimited’
end
end
end

Form is pretty standard, including the error_messages part
<%= error_messages_for :user %>
<%= image_tag ‘signup_header.jpg’ %>

For your unlimited account

<% form_for :user, :url => { :action => :signup_unlimited_create } do | f| %>