Power Adapter fails

I have one of the powerchords HP wants to replace because there is a risk of it melting or catch a fire. I have had an issue with my whole adapter since this summer, the first time it overheated big time and didnt charge my laptop anymore, after a cooldown period of an hour it started working again but now it completely stopped functioning. When i called the Dutch helpdesk i was told that the powerchord has nothing to do with my dead adapter and since i purchased too long ago i had no more rights and would have to purchase a new adapter. Funny thing is, the first time i called an employee, she said HP would probarbly replace the adapter too, but i didnt have my serial number presence and she couldnt help me that time. Next time i called , i was told i had to purchase a new one.
I would like an explanation why an adapter that died because of overheating is not dead because of a powerchord that might overheat or melt.

thanks for your quick reply.
Yes, it is the original charger that is dead. (sorry for calling it adapter, dutch word for it, sounded english )
I did call the dutch helpdesk 3 times , first time i didnt have the serial number, second time the connection was ended when i said i wasnt pleased with the answer and the last time they said HP procedures said : powerchord recall has nothing to do with your dead charger. Never did any of the employees suggest to escalate it. I dont really feel like calling again.

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Power Adapter fails

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