The worst service ever

Worst ever. I have purchased a sofa online. No where it said "no stock or anything close to the different excuses I have been given within 2 days. The purchase was done on the 23 May 2020. Bear in mind, the online purchases and deliveries were permitted already. Paid for delivery which was suppose to take place within 3-10 days. No call or e-mail until I phoned their call center no which seem very busy. I was told I will be called before COB on the 5- June 2020. I followed up on Monday the 8th, I was given a number by a rude consultant which went unanswered. I phoned the call center again, only to be told, they think they ran out of stock and I will be contacted when they have the stock of my order again. Why on earth will you not communicate with your clients if you are experiencing backlog or any issues? You buy from them at your own risk.. I'm really frustrated