Leaking baby bottles

I purchased a set of Dr Browns baby bottles with the knowledge and belief that they were the best for newborns, to my surprise the bottles were leaking and I tried using warm or cool water but still there was no difference. I was really disappointed as to that with the amount that I paid For the set I did not get my money’s worth from the product. I am very disappointed with the product and would not recommend the brand to any first time parents like myself.