Order number o***7 not delivered

I purchased clothing online for over R2K. The wrong items were delivered with my invoice in the bag. I have spoken to 3 different call centre agents and they all tell me someone will call me back and nobody does. Also I keep getting text messages that my order has been processed and delivered. How do I get my order back or a refund? Tired of being sent from pillar to post to resolve this. Shape up Truworths.