Contract was renewed for just a small account change

I started my Internet/Cable service in October, 2018.  Since then, I noticed I was over my data limit so signed up for unlimited data.  My contract date stayed the same.  After several people moved out of my house (my kids) I was able to remove the unlimited data plan.  However, my contract was then renewed.  I need to talk to someone to see if I can have the old contract date renewed.