How to increase Bandwidth Limit Exceeded from WHM reseller panel..
1. Login to your WHM account.
2. Search to Account functions form the Search bar and Navigate to Limit Bandwidth Usage
3. Select the User or Domain which one wants to increase the bandwidth and click on Limit
4. Set the bandwidth limitation from there as you can wish and click on Change.
5. Once done, Go to List account and search domain or user and unsuspend the domain.