Rainbow Shops review: order wasn't full and seller didn't react to our emails

We bought clothes from site www.rainbowshops.com. Their prices weren’t high and they offered free delivery over the order of $100. We placed the order and paid $108. So, the delivery must be for free, but this company charged us anyway. It was strange, but we wanted to get our stuff, therefore we haven’t asked to explain why they took this sum. We got the order, but the order wasn’t full. 3 t-shirts were missing. The seller ignored our emails.