Sick of being harassed

I am so utterly disappointed. I have received tons of harassing calls from Nedbank and their call center demanding monies which I owe for my outstanding credit card. I do owe the money and made an arrangement to make a R500 monthly payment which I have been doing until tragedy struck me. On 2 March 2024 I met with an accident and had both my legs amputated. I am unable to work. I sent confirmation from my surgeon confirming this. Despite this they are still harassing me for payment. I even asked if there is a clause in my credit card agreement stating if I am in an accident and not able to work but no answer. I am cripple for crying in a bucket and asking for help but no one wants to