Lectera.com - online education platform - Not interested in new customers

I saw an advertisement for a training platform and found it very interesting. In addition, I ran
through other courses, including paid, outlined what I needed and could buy.
Well, decided. Filled out the advertising form. I received a promo code, welcome letters,
everything is great. But here's the trouble. I go - click registration, they tell me that the account is
already registered. Okay, I click login. It says - you need to confirm my e-mail.