Poor service

Im sending a review again to engen diepkloof zone 5 service station for the 2nd time now its been 3 weeks now since they promised to fix my car after they put wrong fuel on the 8th, all im getting is excuses and every time it has to be me who keep phoning them all they do is making empty promises, I regret why I had to them for service they ruined my plans my money and they inconvenienced me with a lot