Struggling to get my Deposit back for 2 Months now

i have moved out of the flat I used to rent from Remax,gave back the keys with no damage to the property or whatsoever,im Currently in JHB so I can only speak to the agent telephonicly and their response is my deposit was already paid back,but I didn't receive anyhting, .they never call me back to give me feedback to inform me what is the process of my deposit,i need to phone them every single day and then they ignore my calls and don't reply to my messages,and if they pick up the phone they say they are busy with my deposit now and then im patiently waiting but nothing is happening, that's whats happening for the last two Months .i just want my deposit back.this is not the service I was expecting from the NO 1 real estate agencies.my deposit was supposed to be paid back in 21 days.i don't know what to do anymore...im tired of asking them when am I getting my money