I am currently in contract with BT until March 2019 and I am getting a £9 a month discount on my BT Infinity 2 for recontracting regarding the March 2017 price increase. Will I be affected by the January 2018 price increase and do I have a right to cancel my contract if I am affected?
You should have received an email in November/December telling you of the price rise if it affects you. You would have been informed then that you had 30 days to notify BT if you were wanting to leave.
If you got the email you are now ouside that time limit so you will not be able to leave because of the price rise.
If you did not get an email you will need to contact BT to establish if one was sent to you and if so when. They will also be able to tell you if the price rise will affect you.