Barclays Credit Card
Payment of non usage charges and late fee

I have already cleared outstanding balance and cancelled my credit card.

However after few months I received bill from the bank regarding non usage charges, subsequesntly the said company charged for late fee and other charges.

Thereafter I called on helpline, it was told by executive that all charges will be reversed and no need to pay any charges.

Even after repeated request to cancel the card the said company sending bills with late fee and other charges by every month.

My say is that, I have not purchased anything by using barclay card therefore I am not supposed to make any payment.

Please help and guide