Woolworths

I bought girl's boots at Woolworths Baywest on the 26th of June 2019. On the 30th October I contacted Woolworths on Facebook Messenger, telling them the the boots is damaged. I told them I don't have the slip anymore. I took back the boots to Woolworths King William's Town today the 13 December 2019. I was told they can only refund me R50 because they do not have stock and the boots was probably on sale. I bought the boots for over R400 for crying out loud. They also mentioned that if they refund the original price it will be their loss unless I have a purchase slip.