Non existing customer service, very poor

We bought a Soho Highback Office Chair for R 3600 (and that was even a marked down special). After a use of no more than 6 months the gas lift mechanism did not work any more - the chair does not stay up but moves down on its own. We have told customer service about the problem, but they refused to repair the fault as the guarantee was expired. They later offered a repair, but never came back to us, never rep**** to our emails. A very poor customer service for such an expensive piece of furniture. We cannot recommend that store.