Worst customer service from any courier, ever!

I’ve been waiting on UPS to deliver a package for the past week. UPS’s app indicated that delivery would be made on Tuesday 15 Dec. I stayed at home the entire day, but no delivery was made. On Thursday 17 Dec I got a notice that a final attempt at delivery had been made and that no further attempts would be made. I called UPS and spoke to Glen at customer care who promised to follow up on Monday 21 Dec. He never did. I called the customer care line again on Monday, and spoke to Charlene who promised that delivery would definitely be made on Monday or Tuesday (21 or 22 Dec). This morning (22 Dec) UPS’s website indicated Delivery had been rescheduled. I called customer service again and was assured by Angel that delivery would be made today (22 Dec). It is now 18:38 on Tuesday evening and no delivery was made. This is the worst customer service I’ve ever had from a courier, bar none!