Delta: Tub Spout - Pull-Up Diverter

I bought this set at Home Depot that comes with everything, the whole set looks very nice as an upgrade to replace the original set that came with the house. Everything was working well, until 4 years later when the pull up diverter kept on getting stuck on the up position. No matter how much I try with all my strength, it just won't push down. I have to take it apart and clean it and try to make it loose again, only to have it work for a few days and then it gets stuck again. I have tried to fix it several times and now I have given up. I just called Delta for replacement of the spout...I have to tell you, Delta customer service is unbeatable. They are so nice and professional, also very knowledgeable with their products, parts, and plumbing issues. I'm so happy with Delta customer service, I will always go with them over the other brands. I have 4 bathrooms in my house, I will continue to buy Delta Faucet's products for all my future needs. Thank you, Delta Faucet!