Deal not honoured ! Who do I escalate too?

In the past couple days I have spent almost 2 hrs on the phone with a Telus person. The first hour to discuss options for my family for cell phones and services and bundle with other services we already have and an offer was sent to me by email aftert that call and the second hour was for us to sign up for the deal that was offered and in an email only to find out after the second hour and verifying my identity etc that Telus would not honour the deal (that I have in writing!) . We have been long time customers of Telus for internet, business services, etc which apparently means nothing. 

So this is a warning that you can't believe the deal offered verbally or even in writing from a Telus representative. Not sure how they can do business this way. It seems the Telus rep just wants to keep you on the phone line for as long as they can - is this how they are paid? This experience has been such a waste of my time .........total disrespect! I wanted to stay with Telus but after this experience I will be seeing what other providers can offer now.  Who can I complain to at Telus about this? Potential customers beware.