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Did you receive any notification that the plan change has been applied?
If yes, then when you tested the speed, is it through WiFi or Wired connection?
If via WiFi, are you connected to the 2.4GHz or 5GHz band network?
What is the make and model of your modem/router?
Please send us a private message and we'll pull up your account to confirm the changes, @antonchandra.