我按照你的要求，1月底将货物发到台湾，4天后你提出有质量问题。怎么翻译

We delivered the goods to Taiwan by the end of Jan according to your requset.You told us there were problems in quality 4 days later.

according to your request,we shipped the goods to taiwan in the end of january.after 4 days ,you put toward the quality

According to your demand, I delivered the goods to Taiwan at the end of January.Four days later, you raised that there was a quality problem.

不知道是不是应该用过去时．．．．

As per your request, our goods have arrived in Taiwan by the end of January. In four days after that, you informed us there're some quality problems in our goods.