Disgruntled Woolworths Customer - unprofessional service

My online shopping order was cancelled on 23 June 2020. I was informed via email that I would be refunded within 24-48 hours. It is now 30 June 2020 and I still have not been refunded. This is after multiple phone calls - being on hold for over 10 minutes at a time because their call center is busy - and deciding not to wait on the line any longer or having waited for over 10 minutes only to have the phone put down by a call center agent because she could not hear me. I have sent multiple emails requesting a phone call about my refund because they apparently need my credit card details since I cannot get through to an agent by phone. I find this service unacceptable and most unprofessional. I have been an online Woolworths customer for over 10 years and spend roughly R10k per month with them. I am a most disgruntled customer!