Makro not honouring advertised pricing

My mom had purchased two Marshall Kilburn Portbale speakers, I'm writing this review on request of her, the advertised price was 399.00, everything was fine, the order was confirmed via email, her bank account was debited with the money, and everytime she checked the order was in processing and due for delivery in three to five working days, 4 days later on the 11th of October she received a makro shopping voucher for R100.00 not knowing why, then on the 12th of October she received an email saying that her order was cancelled to be refunded due to an error in the pricing and she will receive a full refund, according to the CPA they can not be held liable for an error in pricing, but according to subclause 1. They failed to update the price on the product that was advertised since 7th of October 2018, they just completely removed the removed the product and was still advertising it online via other sites. Subclause 2. They didn't take reasonable steps to inform my mother of the error, receiving an email 5 days later doesn't count as being reasonable, nor is a R100. 00 voucher acceptable compensation for the loss of product. R100 is not worth 5 days of waiting for a product to arrive, infact that just covers Makro delivery fee, time is money, 5 days to correct an error on your side saying, we have to accept a refund is not acceptable, we don't want the money back, or the R100 we want the product that we paid for, no official corrospondence from Makro, no consultant has phoned to personally apologise or to try and remedy the situation, we would have been open to purchase the product at a different price, because it was promised as a present to a 12 year old little girl. This debacle has caused embarresemnt to my mother and R100 doesn't constitute the trouble caused. Makro doesn't speak to you unless you post on Hello Peter hoping for some feedback today. Not just an automated message.