Atomberg Technologies Pvt Ltd - gst billing not provided by atomberg

i placed order atomberg official site. i had put all details of mine. after paymnet done, i realise that gst details not taken from me. i contacted but their number is not connecting. i emailed them to cancel the order and refund me because gst billing, if they provide gst invoice than complete the order otherwise cancel it. they said me on call that they are cancelling the order. after order cancellation on website and email. they despatch the oreder via courier. i called them again, but they are not providing any proper information. and they are nationalise company and fast groving, and they can't provide gst billing to their customers.