Webuycars Gold sticker mean nothing after you bought a car

Recently went to purchase a vehicle at Webuycars, Midstream branch. The car was advertised as having a Gold Sticker, meaning the vehicle will pass a roadworthy test, they even gave me a Dekra voucher. Boom the vehicle failed a roadworthy test, report back to the sale person, and to their call centre by the name Angelina Masango. Told they'll investigate. Week later, still investigating and Angelina not answer emails or returning calls. Now seating with a vehicle which is not road worthy and I cannot drive it. Horrible horrible experience....stay away from them