Or, just write the output manually using the string() method:

#!/usr/bin/perl
use strict;
use warnings;
use Class::CSV;

my $report_csv = Class::CSV->new
                 (
                     fields => [qw/VM_Name VM_Cluster vFiler_IP vFiler
+_Cluster MisMatch/],
                 );               

$report_csv->add_line( {
                           VM_Name        => "VM1",
                           VM_Cluster     => "CLUSTER_1",
                           vFiler_IP      => "1.1.1.1",
                           vFiler_Cluster => "CLUSTER_2",
                           MisMatch       => "What_is_that",
                        } );

my $cvs_as_string = $report_csv->string();
my $outfile = 'final.csv';
open(my $fh, '>', $outfile) or die "Unable to open file '$outfile' for
+ writing: $!";
print $fh $cvs_as_string;
close($fh)                  or die "Unable to close file '$outfile': $
+!";
[download]

HTH,