Brand New Pagid Brake Pads and Discs(Rotors)

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2014 cx5 2.2 d sport nav 5d 148 bhp (64 Reg)
So..... i replaced the front' pads and Discs(rotors)
And the pads only for the rears. My mechanic said i should change the rear pads only as the disc are absolutely fine. Although i bought the rear discs too.

I've done over 700 miles since the changes and the rear pads are screeching and the front screeching is evident.

Pagid is a good brand but I'm baffled. He did all the recommended cleaning needed for the rear calipers.

Any suggestions guys?
 
Can't speak to the fronts, but the rear rotors should have been turned. IMO, unless the front rotors were badly scarred, those could have been turned too for less $$ (sorry-pounds!) than new.
 
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