House & Home false instore advertising and worst customer service

On the 16th December 2019, my husband and I went to purchase a washing machine. My husband found a Hisense Washing machine 18kg for R5699. We were assisted by a sales consultant, Mr Z Lakay and indicated that this was an excellent choice. We proceeded to complete the transaction on the system, only to be overcharged for delivery. Upon arriving at the till to pay, there was an error as the washing machine was priced at R6999. The sales consultant returned to say that there was an incorrect promotion placed at the washing machine and that the promotion was for a small washing machine. The store manager proceeded to say that the he was unable to help us with that price as the sign has the correct barcode listed. My husband asked how are we suppose to check the barcode of each washing machine to check if the staff had done their job correctly. The service was so upsetting and we were sent off to find a retailer who could actually perform better in customer service.