Worst after purchase service

I have never received such bad after purchase service. I bought a dishwasher mid 2019. The dishwasher had issues almost immediately and i organised a Hisense technician to fix the unit. The unit worked for another 2 weeks before failing again. Since then i have been in contact with numerous call center individuals and had 2 technicians visit to look at the unit. The technicians say that a part is required but the part is not available. This has been ongoing for over 18 months. I have requested a replacement unit or a refund but have been ignored as the Hisense solution is always to send another technician. If you can avoid buying this brand, best do.