I bought a heater online on the 1st of July and I was send a message to expect delivery on the 5th July

I bought a heater online on the 1st of July and I was send a message to expect delivery on the 5th July. That did not happen, I call the call centre today and I’m told the query will be escalated and when I ask when should I expect feedback, Siyabonga Nodada the agent assisting me tells of 72 hours turn around. So I request to speak to someone senior. He keeps me on hold for 15 minutes and tells me the manager is busy and will call be back. He refused to give me the name of the manager and he was reluctant to give me his name also.