Where is my delivery? And why are you keeping quiet when I ask...

On 30 November I ordered 4 garden chairs. the due date for delivery was provided as 4 December 2024; this was great as my birthday was that weekend and we planned to have seating for everyone coming to a small get together. However, no communication was provided that the chairs were not coming and no chairs were delivered. I logged a query the next week asking the status of the delivery, the only response received was that the customer query lines were really busy. No further response was received w.r.t the status of the delivery. Again we are planning a get together this weekend with no seating available. Upon logging the complaint again today, the careline person was most apologetic but no commitments were made. Only when I made it clear that I will expect the chairs to actually be delivered, sooner rather than later, the person on the Makro helpline seemed to understand what was to be done. My thoughts on this are, why else would I actually phone, not to hear apologies? The customer's expectation is, if they had paid for something and had been promised a delivery by x date, then it needs to happen. Don't make your problem my problem. And, it make it worse by keeping quiet when I reach out.