Assistance with orders being delayed

I have placed an order with a couple of essential goods on the 21st of April, each time getting close the delivery time gets moved to a later date. I do understand that they need to get stock maybe from a supplier but when the order was placed I was not informed that there might be items that will take longer to deliver due to stock issues. I have tried to contact takealot.com various times to try and see if the item that is keeping the order could be removed or the order canceled entirely and just order the other items that are in stock but no reply. They are too busy on their Twitter account to run mother's day promotions rather than helping a paying client, after sending two DMs to them and sending one every hour and mentioning them in each Tweet.