False advertising and customer service

On the 2nd of February I ordered an iPhone online from Makro only to learn that they have serious false advertising practices and do not deliver on the expectation. It says it's 'In Stock' but they fail to say that their supplier has it in stock and not Makro themselves, the second problem is that the delivery time-frame will be within 21 days, the 'Store Collection' does not have a 21 day timeframe, however when I follow-up with the contact centre, they are adamant that collection is also in 21 days. The expectation that is created cannot be delivered on. The second problem is that any escalations to the contact centre management is absolutely terrible and they do not deliver on their commitments. The first escalation was at 10:00 on 5 February 2021 to Siphiso Sibiya (the supervisor) who comitted to give me feedback before the end of the day I phoned back at 15:50 and was told that he is in a meeting and will phone me back, I'm still waiting for that call (9 February 2021). I phone again to escalate to Siphiso's manager and managed to talk to Anthony Vermeulen at 14:50 and had to explain the entire story again and got a commitment that he will phone me back before the end of the day, I phoned his direct number at 17:53 and got no answer. It should be no surprise that it is now the 9th of February 2021 and have still not received a call back, so at least they are consistent in not delivering on their promises. I really have no idea how to escalate this further for real attention and action.