BMO Harris Bank review: signed me up for a credit card terminal... and it is costing me!

BMO Harris is from Canada. They recommended Moneris Credit Card services and they said no problem and no fees. I was to save about $250-300 per year. Now we are getting no help and Moneris is trying to charge me $2650 to stop using their services after 2.5 years. We sold our dental office (Zietz dental)
We are harassed weekly.
Moneris threatens us and BMO Harris bank in Middleton said we can not help.