Home Shopping Network HSN Credit card rip off Nationwide

I called HSN to order a laptop. The representative talked me into getting the hsn credit card. Said I would get the laptop cheaper. I went online to pay the credit card bill before it was due. Then I got a bill that included late fee and interest. I called HSN. I was told that they could see on their screen that I had given them my banking account and routing number. However, an additional button didn't get pushed and it didn't go through. Therefore I owe interest and penalty. I told the hsn credit card rep that I had in good faith attempted to pay my entire balance in full before the due date and asked that they accept my payment and not charge interest and penalties. She said no. If I didn't close my account they would remove part of the charges. Fine, but I still wanted to pay off the entire balance which I did. Then I got another bill for more finance charges. I called again. They refused to remove the charge. I was told that even though I asked to pay the entire balance, they did not take the entire balance and I needed to pay yet again more interest on the interest. This laptop that I was told would cost less if I got the hsn credit card has cost me dearly. All hsn needed to do was to accept my payment in full and credit me for the penalties and interest. They could have made me a happily returning customer. Instead they choose to lose one over their own greed.