Comenity Bank Purchased computer from HSN on interest free promotion Internet

In November I was watching a live broadcast of Home Shopping Network and an HP laptop computer for about $430.00. I ordered online and selected the 1 year no interest promotion that they were advertising and charged it to my HSN private label credit card through Comenity Bank. I contacted them in January when I saw on my statement that I was being charged interest. They put my inquiry in dispute. It took almost 2 months for a reply. I reached out to them twice they would reply by email they were still researching. I received a response yesterday and was told that this computer was not being offered by the promotional financing. I replied back insisting that it was offered and that I was going to just pay off the balance within 30 days and close my account. I received a reply today asking me to call them at 1-888--724-6649 as soon as possible. I replied to them that I have wasted enough time on this issue basically calling me a liar. I am just going to pay off the account and closing the account. I want everyone to beware how Comenity Bank does business with the HSN card.