Review on HP 645A Magenta Toner Cartridge C9733A by Coby Hall

I always keep a supply of each color of toner in stock because we sometimes have random emergency products that arrive in production over the weekend. Bought this cartridge 8 months ago. I went to replace it yesterday and it broke. Magenta toner everywhere. I had to call a mechanic to fix the car. Apparently these nearly $400 cartridges are non-refundable even if they are defective. I would never buy this from Revain again. I don't have time to look up the return policy, but it's not clearly stated anywhere.