Sorry, you can’t currently place an order online

I would assume they would check that also, but it could be a small detail that they may not have noticed, so they didn’t bring it up. 

The fact that it only happens when you are adding a phone line instead of a “mobile internet” line (just what we call anything that has service that isnt a phone), suggests to me that it has to do with line count or plan type. I don’t think it is anything to do with your access permissions on the website because those other orders would be affected to. I could be wrong, but I have been doing this a long time and that is my hunch. 

I can understand if you are apprehensive about sharing your plan name or number of lines on a public space, so if you want to DM me, you can. It would be best for me to know how many phone lines you have on your account and your plan name, so that I can rule those out as the issue. If you could also share the promotion you were looking at, I can see if we still have similar stuff going on so you can still save big on cool stuff. :)