False advertising

I app**** for credit with Lewis online and was contacted by Lewis Wynberg branch confirming credit. I went in store on 19 Jan 2023 and selected my goods. As I went in store late I accepted next day delivery. I received delivery 20 February and informed the store that I was going to collect my cash back the same day as advertised. I was told that they do not have cash in store at the moment I informed them that I was coming late in the afternoon around 4 as they close at 5. I was called after 4 to advise they still don't have cash. I went in store to cancel my contract with them and at that point 10 minutes before closing the manager decided to call a different branch to assist with the cashback and was told they also did not have and were cashing up already. My problem is why was such arrangements not done before I arrived. They knew they were delivering today. I was in contact with the sales lady and the manager during the day informing them that I would be coming to collect the cashback today, they could have made arrangements prior to me arriving there. I have informed them that I am canceling the contract and they can collect their goods tomorrow, the manager informed me that there is no paper work to sign to cancel. I hope this is true as I don't want the debit order to come off and no longer want to do business with Lewis wynberg. I am also no interested in the free gift that u was offered. What Lewis advertise and what customers get is totay different as no where does it say that cashback is only available if the store has collected enough cash on the day.