Repairs backlog

I handed in a 2 month old inverter under warranty that failed after 2 uses totalling about 90 minutes. 2 weeks later it hasn't even been looked at due to an apparent backlog. Asked for a replacement unit, fund or credit to purchase a replacement but they won't do anything until they have looked it my unit. I have also never received feedback. I always have to call them. A week ago they promised to expedite. Today again they promise the same. Hugh, the sales manager in JHB won't even commit to anything. I must just wait until they are good and ready. Reminder to self. Never buy anything from these guys again.