ABSA Student Cheque Account

My son had a savings account with ABSA, when he turned 18 he was asked to come to the branch so that he is main signatory. The consultant that was helping him advised to open a student cheque account. The account was not serviced. This year I started to get calls from ABSA wanting to speak to him. Every time I asked to assist an agent will say no they want to speak to him directly. They were always calling during office hours when he is in class. Then I got an sms that he has been handed over to debt collectors. We went to the Centurion branch that opened his account to close the cheque account. We could not because as a client you need to call the call centre and they do not open on Saturdays. As a mother I also cannot call because they want to speak to him directly. He is in class Monday-Friday how do we solve this. ABSA has handed over a 19 year old to debt collectors for R75.40. How is he expected to manage this account. Debt collector are calling religiously at 7h40 every day to speak to him on my phone and I explain the same thing every day. To me this is ********* to handover a student whom they cannot communicate with him. Even the methods of communicate him is not conducive for students. ABSA do not assist even with a plan to recover this money.