Tooth Sensitivity After Permanent Crown Placement, Also Affecting Non-Crowned Teeth?

I recently had a permanent crown placed on the upper molar on my left side. After placement, cold sensitivity set in, mostly around the recently crowned tooth. Everything online and from my dentist said it should go away within a week, possibly two. It has been over a month and the sensitivity is getting more intense with each interaction with something even slightly cold and the teeth below the crowned tooth are also starting to feel sensitive to cold. What went wrong and what can fix it?