Poor delivery service and customer service

I’m currently struggling with this company. On the 4th November 2022 I received a message informing me that my delivery was on the way, midday I get an email from them crediting me for the items that were meant to be delivered claiming that the items were “lost in transit”. I had to contact them to find out why was this taking place and asked them to repurchase the items for me. Now it’s the 10th of November 2022 and I’ve only received one of the items, the other item hasn’t been shipped and it doesn’t look like it will. I’m not receiving any sort of communication from the company with regards to this package, it’s a nightmare and a big inconvenience. Not sure what to do.