Purchase Ticket Experience.....on-line Was Inaccurate!!!!

I thought I had completed a ticket request which was confirmed but after calling your customer service #, I found that the ticket wasn't available.   I am so glad that I called since I got an error message and the screen went blank after I had completed the entry of my credit card information and hit "buy ticket".   There should have been some type of notice to me that my purchase didn't go through, just as was explained to me when I placed the call.   YOu need to fix this so people don't leave your site thinking that they have purchased a ticket.   I will certainly not want to use your site again!!!