Poor service

Good day I bought a bed in November 17 2024 . The bed starting giving me back problems . I went to the store at The Glen Mall to try and report the matter. One of the sales lady tried to call the store manager and she rudely said to her over the phone that the 30 days guarantee has passed and she is unable to help me. I then sent the store and the store manger emails asking if i could get the bed exchanged s it hurts my back and she refused and said i must refer to the guarantee and their terms and conditions. She also said that i needed to buy the mattress cover with the bed however the sales consultant who was helping me at the time of purchase did not mention any of this to me .I only learned of the mattress protector when i went to the store lodge my complaint. Luckily i had my own bed protector and even sent her pictures of the bed with the bed protector however the store manager still refused to help me and said there is nothing that she can do for me because 30 days has passed. I ask for assistance in this matter because its unfair, unjust and ******** according to the consumer protection act 68 of 2008 to treat consumers in this manner when tons of money is paid to the organization which promises to give comfort with regards to their product