Customer service stinks!

On 18 March 2022 I bought items via the ASAP app and used the Promo Code "RAYDAYS2" as advertised to get the delivery for free. When I continued with the purchase, the app registered the code as "Active code", but still charged me the R35 for delivery. I cancelled the purchase and immediately contacted the ASAP Department via the online form on their website. I also called the number and reported the issue verbally. I was told to continue with the purchase and if the app still doesn't give me the purchase for free, I must contact them for a refund. I received an email reply on the webform I submitted, with a message "Your request (194906) has been received and is being reviewed by our support staff. To add additional comments, reply to this email." I took a screenshot of the transaction on my phone and rep**** to this email message with it. Since then I have not heard a word from Pick 'n Pay, even after I submitted a follow-up email on 23 March. I think their customer service stinks!