Hi [CUSTOMER_NAME],
I am writing to follow-up on my earlier email.
Since I did not hear back from you so I just wanted to make sure that you received my email. In the case that you did and have any questions I’m always available for a quick chat. Just write back to me or call me [PHONE_NUMBER].
I look forward to hear from you.
Regards,
[YOUR_NAME]
[YOUR_POSITION]