Engen false advertising to con people into buying more fuel

false advertising -their competiton reads spend R600 or more on fuel in a week at engen and you can enter a compettion .I put in in R500 and then R100 on the 11th of August 2025 at 07h21 at Monresa station in Boksburg and was refused an entry into the competition.The owner of the franchise even called the head office and they say it had to be R600 in one transaction.Legally their wording says R600 in one week making me qualify.