Miss

my experience with nedbank was disgusting after banking with them for 8years , they keep on accumulating charges on my account ,when i call them to query this they tell it for debit orders ,for months i told them to revers those cos i do not know them,they told me they cant stop them, i need to call those companies to cancel ,how can i call people i do no know?,and also told the to stop those debit orders the said they cant,now they keep on sending me messages stating i have -4282,75,i have to pay them for bank charges.how can i pay something that i do not know?.