I just cancelled my HSN card

I am completely furious!!! A few days ago I received an email telling my payment was past due. I immediately paid it online. Today I get the bill in the mail (bc they cancelled my paperless option) and I have a $27 late fee charge on a $7 past due amount! I called and the reps act so nonchalantly. They don’t give a if I cancelled or not. I told her I refused to pay that late fee and that I had just canceled and all she said was “okay, I’ll make on a note of it” WOW! WOW! I know I was not a big spender but I always paid my bill on time and most of the time in FULL. I have never been late and REALLY? REALLY? so . I know is my fault and no one else’s for being late. I just want to remind HSN Synchrony that they also made a mistake on removing e-billing and e-paying. I used to receive the bill through my email and through my bank’s billing payment system and was paid always.