For what its worth I have had little to no issues with the communication with QSC even as a first time buyer, though I will admit the bank issues happened right after I placed my order and I was worried my order would be impacted due to it since I did bank transfer.
But I checked in with QSC yesterday, waited a day for a response and was told it shipped already. I only placed the order back on 12/24 or so during the end of the Christmas sale. im expecting 2-4 weeks shipping and handling time.
Really contact with QSC is just slow. Not nonexistent as so many people say. You are probably just annoying as fuck. Try leaving all your questions and info in one set of messages at once so they can read it and get back to you, and be nice. The assistant on the other end is still a person after all, probably with a family, bills, worries, and dreams just like you and me.
I am personally not sure if I will order from QSC again, not because of any specific issue, but just because they accept such limited payment options, and I honestly have no interest in dealing with crypto exchanges which are just a major scam. That being said I am a broke ass bitch so the prices really cannot be beat.