Deposit Refund

I stayed in Atkinson house from 2014 until early this year 2020 when i moved there i was asked to pay a deposit of R1800.00 which i did . I signed their papers and their room was neat no damages when i moved out but now they dont want to refund me my money . there are telling me that my atm deposit doesn't reflect on their statement i have to go back to FNB which i did and FNB told me that the money reflect if the money doesn't they have to send an email to them and quiry it since i send them the proof of payment . The said part is that why are they doing this to us as their clients .I spoke to Nosipho she was helpful and Valencia Ephraim she told me to go to FNB knowing very well im not Afhco's account holder. Im very sad every complains about their refund .the question is why are you doing this to us as your clients on top of that send the proof of payment why don't the check their statement