Parsons Pest management does not deliver promised product; does not deliver refund. Internet

Background of the purchase:

I placed an on-line order with Parsons Pest Control for streptomycin and Mancozeb on May 10, 2011. The order was acknowledged by Josephine Ruiz via email. The order was paid by credit card, and my Master Card account was debited immediately. On June 2 Parsons notified me by email that the material was back-ordered.

On October 27, 2011 I called Parsons Pest Management (at 1-888-848-6690, as specified in the back-order notice from Parsons).  The Parsons representative acknowledged my order was still open. Because it had not shipped and the material was still out of stock, the order was cancelled per my request.   When the order was cancelled, the representative told me that, because of the elapsed time, the Parsons accounting department would no longer have my credit card information to credit my account, and someone at Parsons would contact me for that information.

The problem starts here:

No one contacted me. So...  On October 31, I  sent an email (to address  specified in the back order notice from Parsons) indicating my contact information as phone number and email, and requested that Parsons contact me. I received no response. So..I sent the same email to Parsons on Nov. 7.

I received no response. So..I sent essentially the same email to Parsons on Nov. 20.  The same day I also sent an email to Parsons via the  contact (Jane Parsons) indicated in a 2011 Parsons press release(http://www.pr.com/press-release/296638). There I described my complaint, and pointed out that Parsons already has a reputation for stiffing on-line customers out of on refunds (http://www.ripoffreport.com/home-garden-stores/parsons-pest-managem/parsons-pest-management-parson-a7704.htm).

I received no response.  So.. On Dec.8, I again sent the request to Parsons, expressing my frustration with Parsons and requesting a refund.

To date Parsons has ignored my communications  regarding the promised refund and no refund has been issued. I filed a report with Better Business Bureau on Dec 17, 2011, and still have not heard from Parsons.  All I want is the promised $72.72 refund.