I used stubmaker to create a perl module with the available soap calls:

stubmaker http://www.website.com/service?WSDL
[download]

Put this perl module in /etc/perl or whereever you put your perl modules for inclusion on your system. The code is pretty basic. Read the contents of a file that you want to post to the service. Post it. Get the response. Print the response..

use strict;
use warnings;
use MySOAPService qw(:all);

# Data file
my $dataFile = "/path/to/dataToPost.xml";

# Open our input file
open(INFILE, $dataFile) or die "Could not open $dataFile: $!\n";

# Set our variable to read contents of our input file
my $postData = do { local $/; <INFILE> };

# Close our input file
close(INFILE);

# Get a response from the post data
my $response = soapCallFromWSDLModule($postData);

print "Response from server: $response\n";
[download]

Hope this helps!