Bad customer service even at Head office

On the 6th November 2023 I bought a pair of boys kids sandals at Sasolburg Mall used my bank card and cash to pay size 9 when I got home shoes was small I then asked my sis to go do exchange at Vereeniging Mark Park Rage near Spitz in the mall she went the exchange was made she got size 10 only to find out that size is also small problem is the didn't give her a slip and she didn't receive the SMS after the transaction I then tried to call them they said they cannot find the exchange slip I then called the head office of customer care where I was assisted by Sanele/ Zanele not really giving me a solution instead keep on telling me there's nothing they can do without a slip but It was not our fault the matter of the slip so we must suffer because of staff that didn't do their job the store I was referred to where the shoes was bought when I try get hold of the lady Lerato N my numbers are now rejected these people are soo rude and I need a solution as I don't have other money to buy another shoes just need an exchange for the right size service for exchange at Rage is very bad when you don't have a slip which is not your fault how does the system there work this is happening to me for the 2nd time, name Pearl contact number: ***/ *** email address ***