Poor customer service

I bought groceries online on the 22 of March 2024, one of the items I had purchased was out of stock. I received an email advising me of the item that was out of stock and informed that amount of this item will be refunded back to my card. It has been three months and I still have not been refunded. I have been contacting the Makro contact centre on numerous occasions and was promised a refund within 7 days of enquiring.This is truly disappointing.