Question their motives

I made an order on Takealot with the value in excess of R10 000. The expected delivery date was in three weeks. This was unusually long, I was disappointed ... and I should have smelt the rat. During the three weeks I checked the Order Tracker - with no progress. I questioned the lack of progress via their facebook page and customer service on three occasions. Every time I was assured, even "promised", that I will receive my order on time. On the very last day, the "Expected Delivery Date", I received the dreaded email that they cannot deliver and is cancelling my order. I wasted three week with my money in their bank account.

Why didn't they cancel the order earlier? Are they doing this with multiple clients? Are they acting like a financial institution, earning interest on client's capital?