Shopper refused to get milk

So I placed an order tonight for some whole milk, the only item I really needed. I added some other stuff I wanted but didn’t need. The shopper refunded my milk so I requested a replacement. He refunded that too. Then did it a third time so I chatted him to ask if he would please get me milk. He ignored me and delivered my order with melted ice cream. I am feeling so done with Instacart. Are there really instances where there is no milk in the store??