Unsatisfied customer - need a refund

I purchased a Defy 614lt Double door fridge in Dec 2023 - this was delivered and then the door was misaligned and they then replaced the fridge. However, the replaced fridge was a bigger problem as the fridge made a large tractor sound - they send in 3 technician and they all tried to put in stuffing etc to try get the fridge not to make a loud sound and i was then told that if the fridge continued with the loud noise - they will authorise for the fridge to be replaced. I now received a message from Defy saying that the technician reported NO FAULT - and therefore the job should be closed. this is totally unacceptable - its almost 4 months down the line and they have just messed me around. I have always owned a defy fridge and did nto have issues like this with the older version - this is definitely a faulty fridge