PEP PLEASE EXPLAIN

I bought a device in March this year and the device was returned for repairs twice already. Why was I not told on the first 3 month that the device can be replaced. This is ridiculous and unacceptable. I am not sure who is the worst in this case. Is it PEP for not communicating or Samsung selling inferior products. I am inconvenienced and cant understand how a new phone needs so much parts replaced. Did I pay for a new phone or a piece of junk