Modern Musician, Hobart, TAS

This is by far the worst company i have ever dealt with, here is my story. Be careful warning!!!! The Modern Musician website as a part of their Black Friday/cyber Monday sale, were offering Shure beta 91a microphones for sale for $404.07 including shipping and GST. On the 29th November as part of the sale I purchase the item online with my credit card and received an invoice(attached) by return email and the full purchase fee was charged to my credit card. On the 30th November I received a phone call from them saying they would have to cancel the sale as they only had one at that price but if I would like to pay their full retail price they could complete the order. It was not stated anywhere on their website that they only had one or even a limited stock. In fact initially I accidentally put two in my shopping cart, which the site allowed me to do. Furthermore, after I made my purchase they continued for 4 and half hours (until the sale was over) to advertise and attempt to sell more copies of the microphone for the discounted amount. I want them to complete the contractual arrangements we both entered into and supply the microphone at the discounted amount. I am concerned that this fraudulent behaviour is purely and potentially a widespread marketing tactic used by the company to mislead online customers.