Poor customer service

On 29 December 2024 i sent my child to buy a R100 flash voucher, R30 viennas , R9 rolls and a bottle of fusion mixer drink. He paid with R200 at till 8 at Shoprite, Site C plaza. On his way back he lost all the receipts including the Flash voucher. He immediately returned to Shoprite to request a reprint of the voucher. He was told he wont be able to be assisted as he did not have the slip of the transaction. I went to the store the following day and requested to see the store manager but was told he is busy upstairs and i left without being assisted. The third day i sent a neighbour to go to the manager and see if he can assist, he was also not able to see the manager as he was again busy somewhere. The lady went to check and my neighbour waited for over an hour only to be told by a different lady that they are not able to see the transction. Please note i am wheelchair bound therefore its not easy for me to go to shoprite everyday until this matter is resolved. Can someone please help me as selling airtime and electricity through the Flash vending system is how i am able to feed my family.