[Complaint] Corsair RMA

I had recently RMAed my Corsair CX500v2 which blew up under mysterious circumstances after only 6 months of purchase. The RMA people ( Kaizen ) accepted the part and said they will be sending a replacement in 4-5 days. I waited.. and waited.. and got the Corsair CX500v3 after around 15 days. Took the part and to my horror, upon opening it, it was completely bent and out of shape but the outside cover was fully sealed with no signs of anyone opening it. Kaizen refused to take it back and their staff told me that they can only repair it.. so the technician over there hit it with some kind of rod to make it straight and now it has 2-3 dent marks on it. The warranty seal was also tampered with so that the screws can be opened. Somehow the PSU is working perfectly fine but I hear strange noises from it when full load is applied. What should I do so that Kaizen accepts it back? Or should I let it be.. because the unit works without any problem, its just the fan that is acting up.
 
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