Money missing

I went to absa on Monday to downgrade my account from cheque account to savings account, i had R3700 left and to my suprise i woke up to R2500 ok fine, i transferred R2000 and left R300 after a purchase only to wake up from that R300 gone again. Today i sent R1250 on my account and available balance is R932.00 R380.00 gone again. I don't understand where my money is going. I called Absa ***** line and they were not helpful, no debit order that went off on my statement. I only have R119 debit order for the 15th. I feel like ever since i downgraded. My acc is messed up. I just lost my job and i can't afford all this money absa is taking out of my acc without even notifying me.