2002 Hyundai Santa Fe Wind Deflectors

I have purchased many vent visors for my vehicles over my 30+ years of driving. Some were in-channel, and some attached to the outside. I purchased these for my daughter's birthday and her first car. These attached too the outside and I noticed that they didn't seem to fit quite right. I attempted to pull them into place hoping that they would stay, but the tape wouldn't hold. I ended up using some 3M double sided automotive grade tape at the edges to hold them. About 3 months later, I noticed they didn't look right and found that they had warped. I am not sure how this had happened as I've had less expensive visors that never did this. We've also had hotter summers and never have I seen this problem. I am also having a problem with the customer service side at this point since they can't even order replacements. Hopefully they will just refund me the money and I can either throw these away or return them since they are defective.