Luxaflex Guarantee worthless

Ordered Luxaflex blinds during July 2021 through Blinder Boutique. Paid R21000 for 4 window roller blinds. Installation occurred in September 2021 and the wrong colour was installed. Waited 4 weeks for the correct colour. During July 2024 realized that all the blinds installed were starting to fray at the ends after one badly frayed at the bottom. Worked through the installer to have it repaired or replaced but what a nightmare. The supplier has issues now with the timeframe. I do not have the blinds 3 years so the guarantee should still be in place. There is no proper communication between the installer and the supplier either on purpose or negligence. I have to keep on following up or else no communication. How can one pay that amount of money with a guarantee still in place but have to jump through hoops now to have the Clearly faulty product replaced/fixed. I will never recommend either of these businesses ever.