Sir/Madam,
This email is in reference to the telephonic conversation made on date __/__/____ (date). I would like to bring to your kind attention that we have to start the services from this week itself to avoid any delay.
This email is to notify you that we have not received any notification regarding the confirmation of services. I hope that you will respond to this email as soon as possible. You may expect a delay in the ______ (Payment/Others) due to delay in the notification from your end.
Regards,
___________ (Name),
___________ (Contact details)
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