No refund for returned online delivery, no customer service assistance

I ordered 4 mugs online which were meant to be 4 for R100. However I was billed full price. As I was unable to cancel the order on their website, I was advised to refuse to accept delivery of the order. I emailed them to inform them of the problem twice on 13 August and again on 24 August, no response and no refund. I have been billed for the items on 13 august and I have been trying to get hold of Woolworths for a refund. Today I tried calling their customer service line at 8.51AM, the message said, sorry this is outside of working hours which they also said are 8AM-5PM on workdays....So Woolworths customer service is absolutely useless. I have not once had a positive experience with their online shopping and I will never ever shop online with them again, I want my refund Woolworths!!!!