Hello,
Please accept this as an official reply from Bitcoin7.com
We admit we had to reverse 4 transactions on the Euro market. The cause of the problem was a bigger delayed transaction through the German payment method Micropayment.de. As we couldn't identify on time if the payment was correct or not we had to reverse these transactions in order to defend the seller of the BTC. All BTC have been returned to the sellers.
We don't expect such problem with the following method to occur again as we removed the methods from their base, which would allow delay or even reversal/chargeback.
Our goal is to defend both the buyers and sellers on the bitcoin7 platform. Reversing the BTC to the seller's wallet was the only 100% defensive method we could have done. Otherwise if the money transaction wouldn't prove to be correct and we haven't responded quickly, we would have needed to reimburse the sellers.