Target doesn't like to give refunds

On December 1, 2008, I made an online purchase of an entertainment center which consisted of 1 table stand and 2 piers. The total price of these pieces of furniture was $941.74. That same evening I found a center at a different store that I like better. I called Target.com to cancel that order. They said that it was too late and the order was already out of the factory. They told me to refuse the order when it was delivered to my house and as long as the packages weren't opened I would receive a full refund. I did that. On the 13th of December there were 2 credits posted to my credit account. One was in the amount of $389.68 and the other was in the amount of $276.04. I called them on the 13th once I received an e-mail that said they had a problem with the 3rd refund. Mind you, I didnâ??t purchase these things separately; I purchased them all at the same time with the same credit card. When I called on the 13th I spoke with Keisha whom said that the remainder of the refund ($276.02) would be credited within 7-10 days. I checked my account and called on the 18th of December. The refund hadn't posted. I spoke with Jovan whom said he issued a refund and it should post in 3-5 business days. He did 2 separate refunds. The only 1 that went thru was the $21.03. Why that happened I don't know. On December 22nd I called again. I spoke with Monica she said to expect the amount owed with tax. I told her the only amount I was owed would be the $254.99. I waited until after Christmas and I called on the 29th. The person I spoke with that day also called Old Navy Visa because he said that the credit wasn't going thru for some reason. We were on 3-way and the ON rep said that there wasnâ??t any reason on their part that the refund wouldn't go thru. Needless to say, it did't happen that day either. I called again last Monday and the person I spoke with said that the system keeps rejecting it. They would have to do an investigation and I would hear back from them within 3 days, which would have been Thursday. I haven't heard from Target. It's as if they are refusing to refund my money, meanwhile this charge is still on my credit card.