Not sure on the laws in Tas, but in SA everything in the house has to be in good working order. So u could actually get out of your lease because they're refusing to fix things around the house. I think you have to notify them on your intent to vacate due to them refusing to fix xyz and they then have a set amount of time (14 days i think) to rectify the problems. If they don't, then you can break the lease with no penalties. Worth checking it out i reckon!