Purchase from innosilicon website

Hello any body ,
Does any body buy from https://www.innosilicon.com ?
I test for order from them directly but there were some reason which made confuse that maybe they are not honest with customer
about 3 days i am talking with them for ordering miner 1 piece , first email which i sent they replied after about 12 hours and very delay in reply , when i told them want buy and why responce very late , they reply sooner , My doubt is here : i told them want deliver miner in china and make invoice for me , they told cannot make invoice and you must pay just with bank transfer to company bank account , after that i told them ok no problem , you send me bank account number and send your information details like name , phone number and address , again he emailed me “you pay to our company bank account and will promise will send for you after money arrived” .

after 3 days about 17 emails i send just for purchase from original website of innosilicon but until now he refused to give any invoice or any information and just say pay and promise will send !!!

I really confused , Is it possible original company of Innosilicon be like this and not send anything and annoy customer or anything else !!!

Any body have experience of purchase of innosilicon original website ?