No OTP arrived, no alternative to proceed

So, I decided to reactivate my Showmax account on Friday evening, to watch some movies and series for the next few months. But I couldn't proceed, because the OTP was never sent to me. Contacted Support: They suggested I use a different number.... But I only have one cellphone number! And that's the extent of their assistance. Can't believe a company doesn't have an alternative to activate an account, old or new. I haven't even proceeded to putting in my banking details, where such security would make sense! Well, you've lost a customer! I can't sit and wait the whole evening hoping an OTP arrives so that I can reactivate an account, or sign up from scratch. (And no, the OTP wasn't in Spam or blocked, and I do have cellphone coverage and a good connection.)