I think you don't try to search for any information first before you decide to buy bitcoin from paxful. If you can search information about how to buy bitcoin with safe, then I don't think that you will use paxful and you will use localbitcoin because localbitcoin will be the best place for everyone to buy bitcoin with people which is near from their house. At least in localbitcoin, you will found many recommended seller which will help you to have bitcoin.
So my advice gives them time to solve your problem, and you should be patient for a while. Next time, you need to be careful before buying bitcoin in any places, make sure you already search the recommended seller, so you don't have the same experience.
I don't think the seller could have done anything to prevent this though, he probably isn't even aware of the doublespent made to him. (Maybe he is, i'm not sure, but it's likely if you do 50/100 paxful transactions a day, that a 100$ transaction more or less isn't immediately noticeable.)
Last thing they asked me was to put picture of my bank statement showing two $100 transaction. how much longer is this going to take?? I send them message again and no response... I think this will be my last time using paxul... takes way to long to get in touch with them..
You expect them to help you without proof? Neither paxful nor the seller is really at fault here, as mentioned. You should take it up with Zelle, as they're the ones who wrongfully authorized a second payment?