Discount decor refuses to process refund

Extremely disappointed with Discount Decor. I once had a good experience with them and now they've just ruined everything. They did not mark that the items I wanted was out of stock (other products were marked), so I ordered and paid for them. They then called me the next day trying to convince me to choose something else because they now say they're out of stock. I asked for a refund and I was assured it would be processed. It's been one month now in which I've called, emailed and texted to which I was finally answered that they would process the refund. A month later and still nothing and now nobody takes calls, my WhatsApp messages are read and unanswered and emails never get followed up. Seems like legal action is the only way to go now... They've lost a loyal customer in me... Sad :(