Be open about which items are holding up delivery and offer customers an alternative

I use Takealot often and as a rule am very happy with their service. What frustrates me, however, is the following: sometimes I order a couple of products and some of it I need urgently eg my dog's food. Takealot doesn't warn you that one of the products you've ordered will take long to deliver. They wait for you to pay, then suddenly move the estimated delivery date further. There is a button called "why the wait?" That tells you that one of the products you've ordered is still at the supplier, but they don't tell you which one! Now I have to wait for the items I need urgently eg dog food. If they had been open and transparent from the start, I could have ordered the essential items separately. So this is a plea to Takealot to make that option available to customers.