Mr Price Home Owes me money

I used to love dealing with Mr Price Home, they carry such awesome products and I have spent a fortune there but the last two weeks have been a nightmare. It started with the ordering of a cupboard on their app, which wasn't on the app the previous night, and when I logged in in the morning, there is was, the perfect cupboard I have been searching for, so I ordered it, paid for it, got a confirmation email and seconds later got an email that it was sold out, they cancelled the order and would refund me. I got a second mail advising that the refund was processed and I'd receive the money in my account within 48 to 72 hours. I am still waiting, it is more than 5 working days and 10 days including weekends. I've raised it with their so called customer service via WhatsApp, on their Chatbot and via e-mail. I have not received a satisfactory response on any platforms and in fact my e-mail has not even received an automated acknowledgement. This is disgraceful, I can't even call it service.