Poor customer service and non-delivery of product paid for!

We bought two chairs in store on the 14th of December 2020. Elias at the store advised that they would be able to deliver on Friday the 18th of December 2020. The delivery did not arrive.... On Monday the 21st of December we went to the store and found the chairs wrapped. Elias advised that the courier company tried to deliver on Thursday the 17th of December, he commented that they tried several times to contact me, I did not have missed-calls on my phone. When I asked which number they called from, he could not give me the number and mentioned that he would have to send an e-mail to the courier company. He advised that they will deliver on Thursday the 24th of December, We waited all day, but no delivery was received. On Monday the 28th of December I called customer care, who then in-turn diverted the call to the store. I again spoke with Elias who promised to call me back to confirm the delivery. No call was received and no delivery either? I again called this morning, I was diverted to Elias again. He advised that the chairs reflected as delivered on the system, but that the chairs were still in store. He again promised to send an e-mail to Head Office to arrange for delivery. I asked that he call me back by 15:00 today. This is totally unacceptable. We will need this to be resolved as a matter of urgency as this product has been paid for!