Bad service I'm receiving from Ekuruleni east Tvet college

I was a student at Ekuruleni east Tvet college did my N4 in 2016 second semester I happen to fail 2 modules I wrote them in 2017 first semester, I was told I don't have to apply for my n4 certificate it will be combined automatically. I did my N5 and N6 then I couldn't receive my certificates because of the N4 certificate. Went to a office I was told I was suppose to apply for it but now I only receive this information I don't have my statement anymore. I told them and then they Saud they will email Department of education I must come back for feedback, I went still nothing useful. Or I'll be told they will call me. It's been 6 years now I haven't received my certificate I can't even apply for in-service training because I don't have certificates. And Ekuruleni east Tvet college has failed me