Zara messed up my order & had to wait 3 weeks for my order to be delivered

I'm deeply disappointed by Zara, iv made an online purchase on the 23rd of January 2024 & they kept on extending the delivery date. I made follow ups several times to enquire with regards to my order through their chat bolt & was told my I must wait for my order to be delivered. Today the 7th of February 2024 my order was delivered & to my discovery the size is thrice bigger than what the size I ordered. Iam so angry, ****ed & frustrated as to now I need to return the shoes do they can be exchanged to the correct size & await 30 days again to be delivered. I jst want to know is this the kind of service that Zara is proud of?? What will happen should they run out of stock whilst Waiting 39 days as the item is not available in stores & only available at their warehouse which is the same warehouse that did the mess???I have been their loyal customer since they opened & own multiple items of theirs bt now m extremely disappointed at their service. How could u mix & put the incorrect size whereas on the correspondence it's clearly shows the correct size ordered. Can Zara advice on how to resolve these issue.