Finish a customization to WooCommerce

Please see the wordpress site at the link below: [login to view URL] The site uses the WooCommerce plugin. The original task was to customize the cart and checkout of the woocommerce plugin to calculate the distance from the address the user types from a set central address point. Depending on the calculated distance, the site should return one of the following to the user: 0-10 miles from location - $5
 10-20 miles from location $10 
20-30 miles from location $25 
 The proper charge should automatically added as a field in the totals area called "Delivery Charge" (right now it says "Shipping Charge on Website) The client only offers delivery of the product within 30 miles of their location. They do not ship their product through any parcel carriers. So what is needed is that the website should automatically calculate the distance to the delivery address entered by the user. If the distance is more than 30 miles, then the website should return the message that the address is out of their delivery area. In this case, the user must choose "Pick up at location". "Pick up at location" should be available as an option for the user regardless of their address. The user should have the option to pick up the order even if they are not within in the delivery area. When the user chooses an option, whether delivery or pick-up, the cost, if any, should be added to the subtotal on both the checkout page and the final payment confirmation page in the appropriate places. This project was two weeks late from another developer and is still not finished and working as was discussed. If you are interested, please message me on freelancer to discuss prior to bidding. I can give you FTP access to see the programming has been done so far. PLEASE READ - Given our unfortunate and disappointing situation with the last freelancer, I have a few rules for this job: If you will require any milestone payments to be released prior to completing the work, the work must be performed on our development server. Discussions will need to take place on freelancers - not skype. We are very disappointed with the last programmer we hired on Freelancer.com. Please change our mind!