Unfairly asking for arrears of deceased son

My son drowned at the Midmar on 7 February. At a time like this, one does not think about his pvr. Towards end of February I uplifted his pvr and have had it in my cupboard. He was on debit order. The person who does your accounts could surely see that it was returned with account closed and not insufficient funds. I went to change ownership into my name but was told to pay R780 for the month of March 2015. This is not at all fair as he is deceased. His flat was sold end of February so no one has ever watched his dstv. Have a heart and credit this amount.