Discouraged by online shopping: late delivery

II placed an order with superbalist on 30th November and was told it would be delivered on 5th December, I choose the cash on delivery option and could track my order quite well. However, on the day of delivery I was messaged to contact them. I did so and was told something about their drivers changing routes so I need to pay in the money, which I did. Yet since I paid in the money and sent the proof of payment, I've hadn't received any communication from them and my delivery status shows dispatched. Since Monday 11th December I've been e-mailing and calling superbalist every day, as I keep being told that they will get back to me with information regarding my delivery, but I hear nothing until I contact them the next day again. I've asked to speak to their management, but was not granted the request by the consultants as they promised to sort out my problem (but everyday a different one makes the same promise), I've even asked if I could pick it up myself at the couriers but that request was too ignore. On Sunday 17th December, I finally received some positive feedback, or so I thought. I was told that everything was sorted and that my package would be delivered Monday or Tuesday for the latest and would receive an sms to confirm it. Up until now I still have not received any sms, when I called again I was told that on the system it shows it will be delivered today, but they didn't have contact with their couriers again, but it should come. It's Tuesday afternoon already and still nothing yet, and I don't even get a response on my emails anymore. What upsets me the most is every time the consultant assures me that he/she will sort it out ASAP and it should be ready by the next day, so i get someone to stay home all day to wait for the delivery as im at work, I constantly have to go and check my phone at work to see if theres any e-mail regarding the delivery, it's a birthday gift that I ordered long in advance to have it on time, but now im not even positive if I would have it by Christmas, not to mention all the data and airtime I've wasted trying to find out about my delivery. It was my first time using superbalist and it was a really unpleasant experience, despite receiving such good reviews from friends. I had a colleague who ordered something from them while I was still waiting and he received his order already, here im still struggling. This is the first time ever that I am left this discouraged by shopping! :(