Won't provide a refund for goods they cannot supply!!!!!

I had to give you 1 star but actually would have liked to have given you 0/5 for the ********** service we have received. At the beginning of Feb 2021 I placed an online order for 2 loungers. I paid some of the amount with vouchers I had received but then also paid approximately R2500 on my Mastercard. Weeks later I receive a text message to say my order is ready for collection at Constantiaberg. My husband drives there to collect and we are told the order is definitely not ready and they don't even know when it will be. Then more days pass and we receive an email to say that you are cancelling the order. By this time I am fed up of waiting for the lungers so think I will take my money elsewhere once I receive a refund and buy them from someone else. The refund eventually arrives but it is not split according to how I paid - part vouchers, part credit card. they have put all R500 9approximate) into my Builders Warehouse online profile so that I have ABSOLUTELY NO CHOICE but to spend all this money with Builders again. Which I definitely do not want to do!!!!! I want a refund (for the portion paid with my card) into my bank account as that is where the money came from. Many, many, many calls to the Helpdesk and Constantiaberg Branch later and we still have had no response or someone that can help us. This is THEFT!!! You took my money, cannot provide the goods but won't give me my money back!!!!!