Senior Certificate

Hi My name is Princess from Durban, I passed my matric in 1997. I then realised that date of birth was wrong , I was born 1979 /03/07 but date of birth on the certificate is 1979/06/06. I noticed late after 6 months had passed and my principal said it was late already. I have been producing my certificate when I m applying for jobs and in tertiary institutions i never had a problem until now. I am a new finance graduate as such I am getting rejection from financial companies that im applying to due to this. I went to the department of education and i was told that they can't changand correct my date of birth since it happened long time,said I must use or attach an affidavit for every application. My life is shuttered I am asingle parent unemployed and unemployable with a degree and two children . This was not even my fault i dont know how it happened .I found a finance job at old mutual was supposed to start tomorrow 02 April 2017 but after they noticed this, i was told they cannot accept an affidavit Please assist on how to resolve this I would really appreciate your assistance Kind Regards Princess