Bad faith in business

My wife and I decided to cut ties with cable but keep our internet (and actually we upgraded our modem). On June 4th of 2024 I called and cancelled the current plan and the representative said we were all set.  I had a monthly bill of about $217 always due on the 17th of every month. I asked specially if I should still pay that bill even though I just cut ties from the cable service. The representative told me PLAINLY that I did not need to pay that amount and I should wait until the 29th of the month for my bill to reset to $121-$137 (that’s the new price with just the internet).  I even reached out to another rep to just confirm what I was told and yep they said the same exact thing.  The 29th comes around the bill hasn’t changed but even worse I was charged additional fees for not paying on the due date! I reached out and had a discussion with the supervisor and of course they said “sorry we can’t do anything about this.” So in conclusion, you can be told something misleading by reps from the actual company itself and when the bill is due you still have to pay it.  What a horrendous show of bad faith and distasteful business practice. Pretty much what they are making clear is that even if their own reps give you specific directions and they end up being WRONG, the customer still becomes responsible for the consequences.