Money disappearing

Our client has put in R5200 into the business account but R700 is missing out the account as we could only get R4500 from this deposit. This bank is a big ******* and when I complained to the guy on facebook, he gives me numbers to call as if I got all the airtime in the world to waste on phone calls. Also my banking app is blocked and he said I must go to an atm or the branch to activate it. I was over a month in hospital and 2 weeks in a coma, I had to learn to walk again and I'm not myself at the moment but I must go into the branch!! This is ridiculous that you taking from our client's deposit that much money!! Becoming the same as Standard bank where money disappeared out the account!!