Beds from home purchase complaint

We bought a bed (Hotelier Orthopaedic 152cm) from Beds from Home in 2019 with a 10 year warranty. We had the bed for about 3 years and already started feeling terrible discomfort. We managed to find the proof of purchase and contacted them to claim on the warranty as it caused alot of back and neck issues over the years. I spoke to someone at the store and they said that the mattress was discontinued a while back (I can imagine this bed was not very popular to many people) and there is a warranty and we can claim on it but there would be a cost involved from our side. That is understandable as its been a few years, we were then quoted an amount of R6,018 which would be due to repair a mattress as part of our WARRANTY plus a professional cleaning service to clean the mattress as its not suitable to return to their factory. They told me due to the cost perhaps I should purchase a new mattress from them as the price is higher than the original bed purchased (I paid R5,449 for the bed). I am really unhappy with this as I had to follow up multiple times to get a response from them and really dont see the purpose of having a warranty when its gonna cost me more to fix something. I would definitely not recommend anyone buys a mattress from them. This bed has caused both my husband and I alot of back, shoulder and neck issues for years.