MTN Failing to give a statement

I had a contract with MTN between 2 ********** , for two smart phones. After the contract ended , they keep sending me Airtime , SMS and data on the two phones, for a period of three months. I was at fault by not telling them to stop the contract , been unemployed during that time. On three occasions their debit orders where unsuccessful, after i starting working , i went straight to MTN , in order for me to settle the amount owed to them , only to be told that the account has been handed over to the debit collectors. On those three occasion , the amount which they tried to debit it amounted to R600-R700, When the debit collectors called me 2017 it was R2500 I requested for a statement , showing how it got to that amount no statement provided , Last week i called MTN directly , gave them my details , telling them i want settle the amount owed , but i need a statement , still today im still waiting , i want to settle my debits , they have my name listed , but they failing to provide me with a statement..How do i pay now ?