If you are subscribed to a ISP Internet plan that reduces your internet speed to 1Mbps/1Mbps (download/upload speed) after you exceed the Internet traffic limit, it is possible that you exceeded the internet traffic you are subscribed to (e.g. you pay for 100 GB montly limit, and you have made an internet traffic of 102 GB).
To prevent situations like this in future, keep an eye on your internet traffic. Every Internet provider offers a website where subscribers can check their internet traffic and every subscribers is given a username and password.
Note: If you're not sure about the internet traffic you pay for, check the contract with your ISP. There you should find all the relevant data (Including the username and password of the ISP's website)
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