Why do TELUS CUSTOMER SUPPORT make me regret I made a call??

Just got off a call with Telus customer support as I wanted to change a plan which is available on the website homepage under Black Friday deals, however the agent on the call says Black Friday deals are only available for phones and not plans. When told her about the plan is visible on your homepage, she mentioned she can not see it and for Black Friday plan deals to call in Dec. When asked if I could talk to the supervisor, the response is there is no supervisor!! 

How does this whole thing work?? All support calls with Telus this year have ended with similar bad experience!