Were you not able to direct the person on the phone to recreate the account for you, and to include all benefits, and then some for the inconvenience?
I've always gotten what I wanted from US ISPs. Say what you want about their evil business practices, but it sure is easy to get whatever weird shit you're asking for with simple "ok, you can't give me this? Please escalate to your manager / please transfer me to retention."
In my experience with phone staff in any large org, once an error is committed, it's generally a one-way street. Attempts to get the person to fix things lead to worse and worse problems, more damage, more problems.
My experience with T-Mobile seems typical: simply wanted to take monthly plans of myself and wife (both with TMbl) and combine into a single family plan. By the time the ordeal was done, I'd forfeit the remainder of my month's payment into the plan, had no functional phone, was being bounced between two different departments neither of whom could fix it, and both of whom insisted the other was the one to fix it.
In the end I just let the money go and moved my phone number onto a competitor. I have no faith the competitor will fare better if some error is made.
My ISP actually closed my contract earlier this year. Out of the blue, I got a phone call from someone about "my cancellation". After some puzzled minutes the operator figured out that someone else with the same name cancelled their account but didn't state a customer ID or his address, so they went on to cancel mine. The operator told me he'd correct this, but a month later my internet access went down all the same.
After some back and forth to get it back up, the next supporter I had on the line said that they actually tried to cancel the cancellation, "but it was already too late for that" and the system didn't let them. That was surely one of the bigger WTF moments I had with support so far.
So, I've had pretty much your exact experience with T-Mobile, but I never did this. I just called and called and called. I'd stay on hold while I lifted or was driving around, it was no skin off my bones. When I had a person, I'd always repeat "this is exactly I want in no uncertain terms. Do you understand? Can you get me this? No? Please transfer me to your supervisor / retention." For some reason, they'd always transfer me up. I've almost never heard "no" to a transfer request. I've never not gotten what I wanted.
So maybe I'm just waaaaay more annoyingly persistent? :P I probably have notes raging at my dickishness on every account I hold.