Mrp sport online has disgusting customer service!

I placed an order for a long sleeve running top online, on the 3rd of May, since shops weren't open during stage 4 lock down, and I needed something warmer to run in. Today, which is over a month later, after still having heard nothing about my order, I phoned to find out where my order is, only to be told that actually the warehouse is out of stock. Firstly, had they done my order when I actually placed it and paid for it, there would have been stock. Secondly I find it unusual that the warehouse does not have stock supposedly... Yet when I popped into mrp sport at pavilion two days ago, to look for something else, I saw the exact same top I ordered and paid for over a month ago, so how does the warehouse not have stock, and even if that is the case... Since I paid for this item to be delivered to my closest mrp store over a month ago... They should source my top from one of their shops then, and sort it out! I am extremely disappointed and frustrated. If I had not phoned to find out where my order was, where they ever going to tell me, or refund me?! Or would I just be waiting forever for a top that I paid for, to never actually arrive?! Absolutely disgusting customer service!