Dear ________ (name),
In reference to the recent conversation we had regarding the overdue payment on __/__/____ (date) in the name of ___________ (name), we got the information that you were going to make a payment on/before __/__/____ (date). You are hereby requested to kindly provide us with an update regarding the overdue payment.
We expect to hear back from you at the earliest. In this regard, please contact us at _____________ (mention contact number) or write us back at ________@____.___ (email address).
[Digital Signature – if applicable]
____________ (Contact details)