Bad service

I had a sales person from Windovert (Davie) do quotations, first he tried to make me pay a higher price than what he had quoted me on saying the prices went up without prior notice, I reported this to his boss who had him sort it out. Davie has given me poor service and I even asked him if he could refer me to someone else. When the blinds got installed, it turns out he didn't do the right measurements as they leave gaps (they don't close properly). Davie had the decency to call me as early as 8:50 to shout and accuse me because he doesn't want to take the blame or he just undermines me since I'm younger. I asked him if he really called to shout and accuse me of something he knows very well is his fault. He haven't spoken to him since two weeks ago and I'm still stuck with blinds that don't close properly. Davie never did his job properly, he failed to explain the product, even after I made payments he never bothered to confirm anything, till I started probing. I have kept all the emails of this appalling behavior from sales reps who only care about their commission other than customer satisfaction. I'm very patient, I will wait for Davie & windovert to sort out that mess.