I can confirm, bitxim.com is scam. The money transfer over PayPal is done by directly sending money to a probably generated PayPal account (sales.([0-9]+)@bitxim.com), so PayPal is not able to help you. After sending 100 USD and 24 hours later, still no Bitcoins on my wallet or any email from bitxim.com. The PayPal transfer was accepted 20 minutes later, so plenty of time to send bitcoins.