Pathetic service, they dont know how to seal their windscreens

I was referred to DGC Glass by King Price in the beginning of December for a windscreen replacement. 3 weeks later the windscreen started making wind sounds, I was advised to take it back to DGC because it was not sealed properly and I did. They replaced their windscreen beginning of January. Now 2 weeks later the wind sounds are starting agai. These guys are ridiculous. I dont understand why one would have to replace a windscreen so many times before they get it right, or will they ever get it right. They said I must bring it back but I dont trust them anymore.