Hi Archana,
Lots of ways to get to this solution. I assume this is part of some kind of ongoing campaign where you can set and forget (as opposed to a batch campaign).
The end result of below is a trackable Support Request program that automatically sends reminders.
Create a ProgramYou could create a Program called Support Signup of something like that. Within that Program, create a List called Members and setup similar to below.
ProgressionHave a Registered progresion that let you track membership and signups.
The Trigger Campaign - The KeyUse a an "Added to List" trigger to the Send Follwips Campaign. A person will get added everytime you upload the list to the local program list. For ongoing management, all you do is import and this campaign will take care of the rest. If the person registered in the past two weeks, the person woould be skipped.
This is a pretty simple example so you might need to add different criteria.
Hope all is well with you and good luck.