Task: Question Generation
Input (English): Context: Hello , I was asking about ordering a diamond today and the rep said since I got a touch within the last year I only qualified for a $ 75 rebate - which I certainly understand $ 150 is for a 2 year upgrade . What I did n't understand was the $ 100 mail in rebate was n't available for people under 2 years - is that true ? I do n't really know what the mail in rebate is about - is it online anywhere for me to see the terms and conditions ? On the plus side I told them BEFORE I order a new phone and sign up for a new contract they would have to see what they could do for me since my contract has expired .
Output (English): What may have caused you to not use the $ 100 rebate ?