Good Morning Sir

To whom it may concern
.
I am expressing my disappointment in our education system. I obtained my National N Diploma in Engineering studies at a Technical College. I have been trying to further my studies into an advanced Diploma but only to be rejected and reasoning is because I do not have a relevant diploma/degree. I would like to gain knowledge from the department of education as to how students like myself holding a diploma from a technical College further their studies if places like unisa, dut and mut say our qualifications are not relevant. Please advise a way forward. Thanking in advance