Dissatisfied client

My son worked for a IT company but resigned, his last working day was 31 January 2022. He phoned this morning after 6 weeks. The lady told him, their system shows he only resigned 1 March 2022. He should wait another 4-6 weeks. That is really unfair. I took the initiative to phone them myself to find out why he should wait another 6 weeks and its not his fault. Kirsten at the call centre told me he can't share any information because I'm the 3rd party. I told him that I do understand, and wanted to speak to their manager. Because my son stays in Northern Cape and I'm in Cape Town. His responds was, that its not possible. My son should phone again, and put in a call back request. I told him my son don't have airtime to make another call. My question to the abovementioned company is, why should we wait 10-12 weeks for payment. How, how, how is that possible in the times we live in!!!!! My son is struggling, and don't have income he needs his money that he already worked for. Just make the payout.