Delta Air Lines complaint: wrong information

I just purchased 4 tickets for a flight from Ontario Ca to Atlanta Georgia. The site would not work, so I called customer help line. 1) site price was less than what they told me – when I asked why they stated that the site was wrong. 2) I asked if I could use my sky miles, which is a little over 7000 and I was told no, I had to have at least 25,000. I told him I knew the miles wouldn’t pay for the full ticket but I wanted to use it on my ticket and I would pay the difference. Again I was told I didn’t have enough I needed at least 25,000. I booked the flight for the 4 ltickets. Then thought about it and got on chat line. I never did get an answer as to why I paid more than the site – at first she thought I used a travel agency but that was not the case and she didn’t know then. She also told me I could have used my miles but now that the reservation was ed I couldn’t use them. None of this makes sense – The site didn’t work I was on the phone for almost 2 hours with customer service to get help with thickets, then again about a half hour on chat. Poor service to say the least and I’m not happy. booking is GHGX9L. The ticket number I was trying to use the miles on is 006-7814557419