Consumer Rights with Dealing with Dell on an OptiPlex 7070 with 6 Major Failures in 8 Months

Hey Community,

I am after some information of my rights when dealing with dell. I purchased a Dell OptiPlex 7070 SFF with Pro warranty until 2026. Since Feb 22, I have had 6 failures that required replacement parts. I have had the mainboard replaced once (they seem to think it needs done again) and I think I'm up to my 5th graphics card. I have asked dell to consider a refund or credit towards another machine as it hasn't met the description (being a poor quality product that fails a lot of the time to work as a normal PC). According to Fair Trading NSW, it states I have the right to ask for "a repair, replacement or refund". It also states (extracted from their website), that the consumer guarantee comes into place for the follow reasons (I have removed the one’s that don't apply)

1) be of acceptable quality
4) be fit for the purpose the business told you it would be fit for
7) meet any extra promises made about performance, condition and quality, such as lifetime guarantees, and money back offers (Not sure if this applies)
8) have spare parts and repair facilities available for a reasonable time after purchase unless you were told otherwise (They have had supply chain issues, which has caused me to go without a desktop for short periods).

I believe the issue is to do with dell removing the front fan on this case, which causes the fans of the GPU / CPU to stress more. I have made sure both front and back have easy access to air flow and this computer is used in an environment that is below 15 degrees year-round. I have also opened the case (as instructed), to which there was no dust to remove (I look after my stuff). Dell, also removed the pins for the front fan from the mainboard, hence adding a OEM fan isn’t an option. Dell advised to remove the covers from the PC and use it that way (this isn’t happening as I may get some dust in). This is my 4th OptiPlex and I have had a total of 7 issues (6 being this one machine).

Dell stated last time that I have no rights under consumer laws as I must follow Dell's policies (makes no sense, I'm a customer). Does anyone have any suggestion on how to deal with dell and if I am within my right to demand a refund. The tech that they send out (he's amazing), just keeps replacing parts and you can hear from first boot up after repair, it doesn't sound normal. Admittedly I got a few months out of the current replacement GPU this time (fan bearing dying/dead), which was beyond my expectations for these newer units.

Any advice would be great (I don't want to have to pay for parts myself to replace, as I have a warranty for that). I believe this issue also falls into the ["Major Problem"] (https://www.fairtrading.nsw.gov.au/buying-products-and-servi…) category under the guidelines,

Evidence of Ongoing job log.