Complaint for pathetic service and unprofessionalism

On the 21st of January I purchased a bed from sleepmasters Protea glen mall. I am not pleased with how they conduct their services, it's pathetic! They promised to deliver on Thursday, I made arrangements since I was not there but they never came. I called them to check they told me about stock. They finally delived on Wednesday, the bed was not comfertable at all it gave me back pains the very first day i slept on it, it was too hard for me. I phoned the shop they asked me to give it few more days maybe the mattress has a fault. A week later, one side of the bed started making crackling sounds. Everytime i turn it makes a noise. Is that what i spent my R4000 on? Wow! I called them again Jenny asked me to wait for month end, she told me to wait for the 8th of February because her sale will be cancelled she will give me a new bed. They put money first. She promised to give me a new bed when I went to the shop, she was out of stock and i also had to arrange my own transport. Finally the head office called, they told me that they were coming to deliver on Friday i took a day off just to wait for my delivery and guess what they never came. Saturday i left my place. That same Saturday evening i recieve a call from some guy he telling me that his there to deliver. I told him that i was not around and that was not the agreement and asked if we could reschedule another date he said no i don't know phone the head office. I tried but the number is forever off. They've been quiet ever since then now I went there after lockdown to check enquire. Jenny told me that they have started phoning people. Everytime i give them a ring using my personal phone they ignore my calls, when i use someone elses phone they answer and get irritated when they hear that its me, they completely loose patience. They promised to check and get back to me but they never did, she even hang up. I phoned again on the the 25th of June. Jenny changed the story, she told me that they don't call people because it is still lockdown and i must wait for level 2. I asked to speak to the manager i was told he was in a meeting that was going to take the whole day, they will ask him to call me back. This Jenny again calls me to beg me to be patient and she wouldn't give me a chance to speak to the manager. I spent my own money for all these run arounds and yet no one is willing to help me. I'm tired really. I trusted sleepmaster but hey im so disappointed, i sleep on a noisy and painful bed and its not even 5 months this thing hurts me. Please intervene. I don't know what to do anymore, I need help.