A month after we launched the loan payoff quote system, customer service found we were overcharging interest. The contracts use a 365-day basis, but the system used 360. About 1,500 customers overpaid roughly $12 each. In the meeting, the business says testing should have caught it. You're the BA on this project. What do you do now?

贷款提前还款报价系统上线一个月后，客服发现利息算多了：合同按 365 天计息，系统用的是 360 天，大约 1,500 位客户平均每人多付了 12 美元。业务方在会上说这是测试没测出来。你是这个项目的 BA，接下来怎么做？