Can't change premium channels online

[Sherrye]

I can’t complete the last step of changing my Optik tv (Telus TV+) premium channels online.  I get to the point where I am asked to continue after changing my selections.

But when I click continue, I get this message

I've tried using different browsers - Chrome, Firefox, Edge with the same results. Disabled all browser extensions and plugins. I am not a new customer and I am current will billing.  We have a Hisense TV (but not this didn’t work on our old television, a Sony, either. 

I am not a new customer and I am paid for this month.  Thanks very much for any help.

[FuzzyLogic]

I had issues making changes to my Optik package. I had to talk to someone in support as I had an older package and Telus needed to make some changes on their end before I could make changes on my own.

[Sherrye]

Yeah, I know what you mean.  But we were just upgraded to Telus TV+ with a new box.