Instruct: Classify Amazon reviews into positive or negative sentiment
Query: used for three months before the lock mechanism jammed, key wouldn't turn anymore...

The lock worked fine for about three months, but one day as I attempted to lock up my bike before a class I found the key wouldn't turn. I reinserted the key several times, but it wouldn't turn, not halfway, not even a quarter of the way. I had an extra cable lock with me, and figured I could fix the lock when I got home. I tried oiling it, and reinserting each of my five keys several different ways, but the lock wouldn't budge. I contacted the company, and was told that I could get a replacement lock by sending in my key tag along with the five keys that accompanied the lock. I sent these in, along with a printed copy of the email I got from the company representative, about three weeks ago. I still haven't heard anything. I'm shopping around for a new lock now, as I'm tired of only relying on my cable locks. I think I will buy a Kryptonite u-lock...