OTP for Digital Editions

I am having trouble with ByteBooks. I try and register and I am not receiving the OTP. I have contacted Support and eventually received a reply asking for screenshots which I sent days ago. The support is woeful. I have tried using my phone without Wi-Fi and with Wi-Fi. I have also tried on my laptop and iPad in private mode as suggested. I have also tried not using private mode. I have checked my spam and junk folders but nothing. I have been trying for nearly two weeks and I have not received a single OTP. I am getting extremely frustrated. It would be great if there was a phone number for Support because the response time is ridiculous.