Can't change plans due to FLEX being on my account

I check every few months to see what's available to me - even two weeks ago I was able to browse new internet plans, but now I'm being told I need to talk to a representative to change plans simply because the free FLEX service is on my account.

I barely use the thing, but this makes for major inconvenience. I've seen other people having the same problem and it was noted as being an error?

I see: "errorCode=DFPLN1011"

Is there any way to un-restrict my account so I can shop plans, or just cancel FLEX, as I don't even use it?  I hate waiting on hold and having someone describe plans and fees to me, I'd rather see it in writing online. 

Others have apparently had success in getting this fixed on their account. Any advice?