Best hair extension wefts?

[Elizabeth&darcy]

I'm trying to find the best supplier to use for hair weft extensions Ive trained in fusion bonds and micro rings but the supplier given to us on the course doesnt do wefts for making clip ins?
I've got wefts from lots of different supplliers claiming to be grade AAA remi hair but after a week or 2 they matt together and condition is rubbish.
Help Please