I graduated with them. Now they don't know me.

I studied for a diploma at Boston Business College in Bloemfontein in Zastron Street( now called Nelson Mandel Drive) I graduated in 2000 for my first diploma and obtained another diploma in 2002. I lost my second certification, I went to their campus and asked for a reprint, the receptionist Sibongile Mxakasa asked for my ID and student number which I don't remember as it is 20 years later. She said she'll look at archives and will call me back, after a month I called her and she said she's still looking. I kept calling her till she started ignoring my calls and emails, I went back to the office and asked to speak to the manager who told me she knew nothing about my case, she also asked for my ID and said she'll follow up and contact me, I waited and waited. I went again to the office where I asked for head office number. I called Ruan Venter and said he will call me back as they need to look at archives cos they were not saved on the computer system by then, after a month I called and emailed, he said I should send something to show I studied or graduated, of which I did, he emailed me his colleague's number from archives Terence van Dieman, who said I never registered with Boston. I need help in getting my certificate as I paid lots of money for those two courses and can't ask for refund.