Cash send, no pin

I am a small business owner, had someone buy a product from me on 23 June 2019 for R700. She said she will do a payment via cash send, when I got the sms I was under the impression it comes with a pin wich she didn't give to me. Only today when I try to draw money I don't have a pin, I don't have her contact number either. Absa told me there's nothing they can do, that's my loss. This is someone who is banking with them. I was told even if they can retrieve that information they can't give it to me, which I understand. So they can't even confirm this transaction with their client so that she can give them the pin then. Nothing was done to help me, all I got was we can't help you. This is not good enough. What I need is a solution.