Threatened by cashier at Ackermans

I went Ackermans Clearwater last night (09 Nov 2018) to collect the items I had via lay bye. Upon my arrival (19h30) there was only 1 cashier. I stood in the line for 5 minutes before they called another cashier. I explain to the cashier what my I came to do at the store. Long story short after I had paid the full amounts and collected the items I told them I want to return one item. They cashier that assisted me with the payment had already left (I had not left the cashiers desk) then the supervisor came after 15 minutes and said another cashier must help me with a refund. The supervisor then took my sleep and made a copy and she said she is keeping the original sleep and I must take the copy. I refused saying other Ackermans stores will not refund my money if I give them a copy of the slip. I want my original slip. She (supervisor) said she has already cancelled the sleep. I told her that but you took all my slips (4 slips - 2 slips for items on laybye and 2 slips for full payments) and you cancelled the wrong slips. They then had to refund all the items and do a cash purchase so I could have a new slip. When I left the store at 20h20 (Siyabonga Ndaba) the cashier that proceeds the incorrect refund chased after me outside the store and said they forgot to make a copy of the slip. I gave him the plastic pack and he took out the slip and went back in the store. I waited outside the store. When he returned he (Siyabonga Ndaba) came back to me and said he took the wrong slip and needs to go back again. I was fuming at this time (20h30) and I said I am not waiting another minute I have other business to attend to. He (Siyabonga Ndaba) threatened me and said he will not give me the slip he already had and he will call the securities to come and apprehend me. I have never been so disgusted, angry, annoyed and humiliated. And all this because they made numerous mistakes and wasted an hour of my time.