Incomplete ewallet withdrawal #***Q

My ewallet was not dispersed fully. I requested R2800 and only R2000 was received (ATM # ***2). I logged a ticket.(the response was decline my enquiry). I don't agree with the response. I was at the branch in Braamfontein yesterday and I was shown the transaction that indicated that a R2000 withdrawal was made at the same ATM. After my withdrawal, I have R1.13 balance - which means my R800 should have been left in my ewallet card, or withdrawn. And none are true. Please rectify this issue ASAP.