Error "Uh-oh, it looks like we have our wires crossed. Intenta nuevamente más tarde".

I had an old t mobile online account which hasn't been used for 4-5 years since I switched providers. It was still  on their system for some reason. Recently I ordered t-mobile internet under the same e-mail. So when i tried to create an online account i found out that my old one is still active. I logged in but couldn't add a t mobile home internet line number. Got this stupid "uo-oh wires crossed message". All I had to do is call home internet tech support ( 1-855-545-4614) . Asked them to unlink an email from my account. So they did it. Called me back in 2 days , linked my email back and the problem was fixed.