Disgusting customer care, no refund after 3 weeks of item being returned

On 21st December I placed an order (***) for three items. I was then notified that one item (black office chair) was not available. I then authorised to proceed with the delivery of the other two items, and bought the office chair somewhere else. On 2nd January all three items arrived, but I sent the black office chair back with the courier. I was promised by MrPrice Home a refund as soon as the order was delivered. I am still waiting. I have been pursuing my refund on the chat since. I have spoken on 5 January with Zinhle, 8th January again with Zinhle, 15th January with Ntombi, 17th January again with Ntombi, 24 January with Siphindile. Every time I am told that I will get a refund in 3 to 5 working days, but it is not happening. Siphindile yesterday promised me to email me the proof that she had escalated the matter, but no email arrived. Is Mr Price Home trying NOT to refund me, that is robbing? Is this customer care deemed decent? I am astounded by the unprofessional manner the whole order was handled, first canceling an item, then delivering it, and now not wanting to refund. Unacceptable.