Changed Plan, no confirmation.

So, I had just downgraded my internet plan and when I got done with the purchase, I was just simply signed out of my account for some reason, and received no confirmation of the purchase. I also noticed that the rate for my upcoming bill never updated to the new rate. I only received an email that said my "accounts are now linked". What accounts? I only have the one. Now I'm worried I'm gonna end up with 2 different bills.