Appalling service and communication

My son paid R10 000 of his own money he saved for to further his education. We received 6 books exactly the same. When we mail the original person he dealt with no reply. If you call the call centre no one answer the voice mail box is full. We have phone over 50 times. Sent numerous email to managers still no reply. No communication about assignments or exams date etc. The service or lack there of is appalling.