That sucks. I don't understand the customs forms, what country are you in? I'm in the U.S. and never had a problem getting miners shipped from China. I get weird forms I don't really understand but they come after delivery.
I ordered an L3 from Asicminermarket and paid with paypal credit since their site didn't give me enough confidence to trust them with crypto, they took their time shipping (2 weeks) and the communication is pretty bad because their English isn't very good but I did get my miner. Besides their prices being high and bad English I had no problems but after reading this if you're in the U.S. I'll probably avoid them in the future.