Refund gone wrong

I visited the store in December to buy a pair of shoes and i was told to put them on laybye as they had no stock, On the 25th January 2019 i went to the store for the shoes and left with them only to find out when i get home that the size is right but its not suitable for wider feet , i then returned the shoe on the 27th and was told that they don't do cash refunds but pay via eft of which i did not have a problem about it. The cashier by the name of lebohang did the refund on the speedpoint of R499 and in a few minutes got an sms on my phone of a transaction that went of of R499 now my question is why are they charging me instead of refunding me. 1: refund not paid back 2:charged R499 3:How much is due to me? The cashiers seem not to know what they were doing ...they need training Spoke to the manager over the phone and he wanted me to listen to what he wanted and not listen to what i was saying nor my complaint , i feel that he does not care about the business and what customers are saying . This whole ordeal has caused me as my debit order will no longer go off as 1 lousy cashier was ignorant in doing their job, i just wonder how many customers are being treated this way or is it that im black and they just don't care or think ill never complain about my hard earned money????? Im looking for answers and some one must take accountability