Credit refund

I bought food online at Woolworths Middelburg Mpumalanga. Some of the items were out of stock when they packed and was this not supp**** however I’v paid the full amount when order was placed. This transaction took place on 30 September 2024 and one month later I have not received the difference of what was paid versus what was supp**** which amounts to R273.35. I’ve communicated through email with them numerous times and till today one month later I have not received a refund for the items not received. As a loyal customer this is totally unacceptable!