onlinetech.com.auは安全ですか？

Our company's tech support email address has received spam from this organisation on multiple occasions over the last few months and a more frequent spate this last week despite us never providing our email address to them. I have 'unsubscribed' many times via their email link and even gone to their website to manually submit an unsubscribe and again after that with a direct request sent via their 'Contact us' form to cease and desist. Despite all the above we continue to receive their emails. Edit: Also; • This business appears to have forged customer reviews. They are shallow and poorly constructed with web-grabbed generic names. • The registered address for this business on the ***** website is an apartment building • THERE ARE NO CONTACT PHONE NUMBERS despite inferring there will be here: https://onlinetech.com.au/simply-customers.php#questions