First you must find out the clause of the quality problems and furnish sufficient evidence.
首先你的查查有关质量问题的条款,并提供足够的证据。
I'll have to ring you back, as I need to have a look at my diary and I haven't got it with me.
我得(等会儿)再给你回电话,因为我要先看看我的日记,而我没有把它带在身边。