Arrangement letter

my phone got ******,so they used it and the bill went up.i stopped paying for it,however Vodacom phoned me to inform me that my account is overdue. i asked them to cancel the contract and made an arrangement to payoff the account. i have been doing that since last year.so i call the call centre asking for a detailed statement showing my payments to Vodacom and i was told that i will receive it within 20 minutes,it's been more than a week and i'm still waiting,i phoned again and i was transferred from pillar to post and they hung up. then i phoned again on thursday asking for an arrangement letter to show that i am paying off the account,i was transferred to more than 3 people,the last one put me on hold then hung up the phone. this is the worst i have ever been treated by a company, ALL I WANT IS AN ARRANGEMENT LETTER AND A DETAILED STATEMENT!