Outrageous bill after migration to Fibre

It took over a month and 14 customer reps + a technician to migrate to Fibre (in the process, they managed to disconnect my home phone for 3 weeks, too).  I was ready to quit then, but I decided to give a chance after one customer rep seemed to have righted many things.  But I was bracing for something to happen (because each renewal never went without something going wrong). Now they charged me $150 more than what they promised me for.  This is a fraud. The mere thought of contacting Telus again exhausts me.  My experience with communicating or dealing with Telus has become so daunting to the point almost traumatic that I really, really don't want to continue anymore. I regret giving them a chance now. But I have to call them. Otherwise, they will be happily charging me $150 more than what they promised for, for the next two years. I really, really, regret it.