Not happy with Absa

Greetings,

Im writing this email with distress, at ABSA germiston today i deposited R1080 for my school registration fee but the ATM declined and said transaction unsuccessful but i did not receive my cash back. One of the absa staff member was there assisting me but they said there's nothin they can do , i have to wait up until Wednesday, and courses are nearly full, so i cant receive any proof of payment to present to the school or any writing stating the issue, this is so stressfull

Isn't there anyway to check the transaction cause im stressed,