Exploretrip.com unknown Ticket issued after flight somehow my fault and no refund Internet

 I bought my airline tickeys 4-5 weeks before my flight date. 3 Roundtrip tickets. Upon arriving at the airport to check in, I found that my 2 year old no longer had a ticket. I paid for it, but a number was never issued and he didn't have a seat. The lady at the counter called exploretrip.com for help. No answer. She found a second number for emergency service and still no response. I had to purchase another ticket. At the next airport, I sent ExploreTrip an email about the situation as they still did not answer the phone. While waiting to board the third plame I received an email from them with a ticket number. It was 6 hours too late, and it turns out was really the ticket that the airline sold me that morning. I finally got ahold of a person on the phone and they asked if I wanted to cancel my ticket.

I told them to go ahead. They must have cancelled my ticket from the airline because I had a lot of difficulty getting my son a seat to get home. They said his ticket had been cancelled and they didn't know why. We finally got home, not from vacation but from a funeral, and I have spent a month now trying to get a refund for the ticket I purchased for my son from ExploreTrip.com with no success. Two days ago they told me I never paid for it. I can prove I did. Yesteady they told me my ticket from the airlinE is the same as their ticket! I used my bank card for all of the tickets, so I can find all of the charges and prove I paid. What the heck! Now what? I paid for my son's ticket twice, bottom line is I paid twice and I want one refunded. I think I'm outta luck and it really sucks. I can't afford to waste $440.00. like that....Any help or advice from anyone would be great. Thanks