Bad customer service from OK Furniture Kimberley - Consumer Complaint for OK Furniture - Head Office

I bought a bed at OK Furniture Kimberley last year and a few months after the bed started giving problems. I reported the problem to the manager (Olivia) and she said I should sent her WhatsApp pictures of the bed which I did. She kept on phoning to inform me that she is still busy with my request and that she didn't forget. Next months I went back and was told that there was a new manager (Celeste) the old one resigned. The new manager told me that she could not find anything logged on her system and told me she can't assist because the bed was no longer under guarantee but she will follow up with the bed company and hear if they did receive a complaint. She didn't come back to me for more than two weeks. I phoned her and she explained that I have to pay R450 for them to replace the mattress only. I feel this is unfair towards me as it is not my fault that the manager who handled my query resigned. If they had sold quality product to me in the first place this wouldn't have been the case. I feel like taking that bed there and drop it in front of their door and insist on all may money back.