Power of Attorney useless at Standard Bank Paarl

I have given my son Power of Attorney to handle anything on my behalf. We are currently out of SA. He went to Standard bank Paarl to get my account number. I have spoken to someone there as well (don't want to mention the name, as, according to her, she's only doing her job). They still refuse to give my son my banking details and now they don't want to email it to me either with te excuse that someone else may read my emails. Now... what is the use of Power of Attorney? I need my account number for deposits as we are stuck here with no means to draw money from an ATM. Standard Bank sucks!