Poor quality merchandise

Specifically purchased a base and mattress (Orthopaedic Premium) from the above, for a seriously injured female with a weight of 60kg and husband of 79kg, which became faulty after 2 years. The mattress lost its support with nails visible in the base. This to me is of extremely poor quality possibly a patent defect as well as latent. Apart from promises to rectify this matter, nothing has come to fruition. On the day of purchase a salesman heard my need and recommended the so called Orthopaedic Superior Turn Free Bed set with a 12 year Service Warranty. Should this not be resolved immediately a Letter of Demand will be sent from the Small Claims Court, Durban to the respondent.