Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Norelco fails on after sale support

I bought a Norelco shaver a couple of years ago and love it...but the blades wore down so I decided to buy new ones. The model number of the shaver recommended I use the HQ5 head so I bought it on Amazon. WRONG.....they are completely different and don't fit. So now I have to go through the ordeal of returning them. After manufacturing such a phenomenal product, Norelco failed on the post sale support big time.