Poor customer service from online store

I bought two Stanley flasks from the online store which according to their own shipping policies would be delivered in 3-5 working days. Three working days after I placed my order, I noticed the tracking said it had not been packed. I had not received any communication about a delay and had to call in the customer care line. The agent who answered was very nice, however, she gave me an undertaking that one of the items were out of stock (despite it being "in stock" when I placed the order) and that they were sourcing this from another branch. The undertaking from the agent said that it would be delivered to the online warehouse that day and sent to the courier. It is now 4 business days later and it has not even been packed. I needed the cups for a trip this weekend and I will no longer be able to use them for their intended purpose due to poor stock management on their side and incorrect undertakings from the call centre. I am not sure I will use them again and unfortunately cannot recommend them.