As the amount owing is considerably overdue we should be grateful if you would send us your cheque by return.

由于所欠金额已逾期很久，如蒙在回复中寄来支票，当十分感激。

youdao

I was disappointed to discover yesterday that we have still not received a cheque from you for the overdue amount.

然而，到昨天为止，我们仍然未收到您的支票，对此我深感失望。

youdao