settlement letter but account not cleared

<p>i paid R8700 in settlement of account later year september and recieved a settlement letter than later on this year i receive a call from vodamcom to inform me that my account is not cleared and i asked them what was the settle letter for if i did not paid and the agent rep**** as is was just to write off and i asked him what does it mean to write off if it is not the amount owed but it looked like the agent does not know what write off means but our conclusion ended up that i still owe vodacom for that contract phone </p>