There will be no additional charges incurred after exhausting all your data allowance however your internet speed will be throttled, meaning you will not get the maximum speed as subscribed. Internet speed will slow down yet you can still browse websites not heavily loaded with graphics and videos.
Hope this helps
Ahh, thank you sir. That's why my plan right now is slowing. Thank you sir. By the way sir what do you mean by 50GB WIRED?
50GB wired = 50GB data allowance under a home broadband/DSL plan.
Your internet connection is via physical wire.