When using Residential Proxies, if you have only 100MB left in your account but try to use more (e.g., 200MB), you can still download the file or load the URL. However, once you've exceeded the available traffic, you will be blocked from further downloads or access until you make a payment and activate a new plan.

The overused traffic will be recorded in your account. When you activate a new plan, the overused traffic will be deducted from it.

This is why, for example, if you order a 1GB plan but only receive 0.9GB of usable traffic, it reflects the overuse from the previous plan.