Big banks not treating us equally

I'm so disappointed on how we are treated at FNB Vryburg branch. One of my loyal customer went to deposit money via ATM on the 13-11-2018 into my account for her DSTV account. The transaction was not successful she had a slip that shows she was depositing amount of R770.00. She reported the matter at the branch and was promised will be sorted within two days but to date nothing. On the 22nd they called her and she was advised that they only see amount of R670.00 She advised them to check as her slip also shows amount of R770.00. On the same day I made a deposit of R670.00 at Hartswater. This week Tuesday I again have to call this customer of mine that her money is not in by now and I think she's taking advantage of me. She advised me no and she will be visiting a branch again the following day (Wednesday 28-11-2018). She did visit the branch and again she's the one accusing me that I got the money and pretend that I didn't get it, As she was advised at the branch that it was cleared on the 22nd(They where referring to the money I deposited at Hartswater). It shows whoever was checking she didn't do her job properly by confirming where that money comes from. I see us black people we are treated otherwise by this big banks. I did visit the branch today and advised them that I've never received that money now between me and my loyal customer we are not in good terms due to they mistake. They where just cool about this not showing to assist me urgently. Now I have lost a customer and again I used my money for them to sort this matter out. How long should I wait for this money to be deposited into my account and I believe I need to be paid back money for transport I used to go to the branch, money used for making calls this customer of mine plus data spent sending her watsapp asking for my money.