Poor Service by Brand

Hi. I bought a diesel watch at edgars store menlyn mall in January 2018 worth R4000 the watch kept losing time, I took back March 2018 and it came back after 6 weeks but it still not fixed, I took it back again on the 16 May 2018. I now request that my watch be replaced or refund if replacement is impossible because I've lost confidence in it. I hope my matter will be resolved. Regards