How can you discontinue Iphone tethering?

so i just got an email from At&t warning me that they know i have been using my jail broken iphone to tether and if i do not discontinue it the will automatically enroll me into the data plan pro 4GB.. I already Have an unlimited and im not trying to lose that. so if they want me to quit the tethering i will.. But how to do so?? please be specific i Have into the 1st to make this change or imma lose my unlimited Data plane to some $45 BS

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