Poor service delivery and poor customer care

On the 20th August, 2024, I upgraded, or ordered a cellphone from MTN network service provider. After the order process, I then received an SMS from DSV global transport and logistics South Africa that my item with the reference number *** will be delivered on the 26th August, 2024. I was even asked to provide instructions for a driver, I then told the lady that, the driver must deliver between 7:30 a.m and 14:30 pm because the address for delivery is my workplace, they agreed without any objection. On the 26th August, 2024, no delivery up until 18:55 pm when the driver called me to deliver, I then told the driver that I am not at work but at home. He said he will deliver the following day. On the 27th August, 2024, there was no call, no delivery. On the 28th August, 2024, in the morning, I called DSV branch, the customer care assistant told me that, my item will be delivered the following day, which is the 29th August, 2024. On the 29th August, 2024, I called the DSV customer care again to track the delivery, the lady told me that my delivery will reach my work place between 14:30pm and 15:30pm but nothing of that nature happened. The driver called me at 16:30pm, asking to deliver, I then told him that I have already knocked- off. I then called the branch to tell them that the driver just called for delivery but I am surprised because I gave an instruction to say the delivery must reach the destination before 14:30 pm, then the lady told me that, on my side of delivery address, the company only delivers between 14:30pm to 16:00pm, which was a new information again, I then reschedule the delivery for the 30th August, 2024, the customer care lady said we cannot reschedule the delivery in absence of an item and she asked me to call the following day early morning for reschedule. In the morning, today, the 30th August, 2024, at 7:45 a.m, I called to reschedule, I am told that my item will be delivered on the 2nd September, 2024. I asked to be transferred to the managing director to lay my complaint because I am desperately in need of that item, I was denied that access. Can you humbly assist in this regards because I need that item as in Today the 30th August as I am travelling and I cannot travel without a phone.