T-mobile charging me after cancellation

they are trying to bill me after canceling t-mobile home internet i cancelled 5 days b4 my next bill date -i imagine if i had not turned off autopay b4 this they would still be trying to collect money ---so now i am stuck trying to get ahold of them i can not access my account do to not having a t-mobile phone number to long yet i can long in on hear to post this ---i also was assured i would not be charged and had no remaining charges when cancelled all i have is the account number and there is no one asking for an account number only phone number this is ridiculous i wonder how many people there stealing from.

i wonder if you have gotten this issue figured out ?