OKI 46484108 Black Drum Unit (Original)

I opened and account and purchased an OKI black image drum unit late afternoon. Early evening, I received a phone call from Cartridge People confirming I was a new customer and offering to replace my order for an identical "Own Brand" unit and £12 refund for its lower price. I explained that I had already considered their own unit but that as I was replacing what "artificial intelligence" had suggested was a damaged unit, I was not sure it would solve the "print quality" problem and, if it did not, I could be certain the problem was elsewhere in the printer. When I described the repeating marks on the printout, the representative said "That will sort it." If I was just replacing and exhausted consumable, I would have accepted their better valued, "own brand" unit.