Poor service

Good day, I trust you are well.

Today I visited Kingsmead at South Coast Mall to purchase a pair of shoes. I was assisted properly; however, when I made the payment, the speed point did not register the transaction even though the money was deducted from my bank account.

The cashier informed me that the manager requires a bank statement as proof that the amount was debited. Unfortunately, no one took my details or offered to contact me after cash-up or daily banking to verify whether there was an excess amount, and I was left without assistance while the staff continued as though nothing had happened.

Kindly advise how I should proceed in this matter. I only receive my official bank statement on the 22nd of each month, meaning I will only get the December statement later. If I request a payment history from the bank now, who will be responsible for the costs?