Very poor service, from customer care line to delivery

I bought 2 items which were the same on the 01 June. On the 03 I got an sms saying my order will be delivered the next day. I was happy to be getting my order so quick. My delivery address was for my work place. On the day of the delivery I went out of the office. To my suprise coming back to my office I found my package delivered and it was only just 1 item. No one called me to tell me my items will be delivered or informing me that they were on their way. Worst of all the person who accepted my order was never told that the order was for 2 items. She accepted the order and they signed for her for 2 items and only gave her 1 item. Now my question is, Are the drivers not supposed to call the person before they deliver. Are they not trained to see when they deliver items on their machines or system that the order was for 2 items and I understand the covid regulations for not allowing the person not to touch or sign on the thing they use for accepting orders. I tried calling their customer care line, i I never received an answere. The machine will tell of high volume calls. Now I understand the high volume calls after researching about them and found out that I m not the only one complaining about their poor service. I am very dissapointed and I want them to send me my other item and I am sure I will never use them again.Order number ***0