Unethical and Dodgy Business Practices

Telemarketer claiming that "you have been selected for a free R5000 share portfolio". Upon asking why they do not have a website - was told that google is too expensive and that there are associated advertising costs. I then asked them to rather send me a email - was told that the email is more than 20GB's or 350 pages and they cannot send it to ordinary email boxes. Extremely questionable and unethical business practices. Do not entertain these calls OR give out your personal information.