Simple theft
I used a BNPL provider (Atome) to purchase a laptop, and Mainz simply never delivered it. When i tried to contact them, they went totally dark; uncontactable on the phone, unresponsive on email and Whatsapp, and their registered company address is wrong/old (currently a huge hole in the ground with a new development going up). Multiple similar experiences started to get reported on Google Maps in the review section, so they disabled their Google account so the company details don't appear on the righthand side of the google search page anymore, so you can't see their one star rating, and/or leave a review and/or see all the one star negative ones of similar incidents. It's been a year now, and i gave up a long time ago trying to contact them. Police report was made, but nothing is happening. Thieves and fraudsters. AVOID