Outstanding Deposit

I am supposed to have received a deposit of R 6165 from Orange Mobile South Africa into my FNB bank account. According to the proof of payment sent by Orange, the deposit was made on April 16th 2015 from a Nedbank SA account. I have contacted FNB on several occasions and I was made to send the proof of payment twice without any feedback. I am an employee of the Central Bank of Lesotho and I am aware of how long it takes to process funds between a Bank in SA and a bank in Lesotho. I am not satisfied that FNB chose to ignore my query as their client.