Bad Service

My son completed his N4, N5 and N6 certificates with Northlink College Panorama Campus in years 2021 to 2022. We have to date not received any of his certificates, we have gone to the College to follow up. They have given email addresses for GHOSTS as these people don't acknowledge emails nor responds. I have sent numerous emails to Heads of the College with also no responds. They advertise for placements with SAPS certified copies of Certificates but how can we apply for a placement so that he can obtain him to graduate and obtain a Diploma in Human Resources Management if we can't even get this Certificates from the institute that is not supplying us with the necessary documents.