Vodacom wants me to pay for something I'm not responsible for

Hello Peter pls do help, vodacom did send me an sms saying the matter is closed, so I didn't understand what do they mean since I had the arrangement with them or am I supposed to continue with the initial agreement of the contract so I got a call from them this morning asking me to make an arrangement to pay that R3582, 45 that I didn't use their simcard pls help me get this matter resolved once n for all even if vodacom can tell me how much should I pay to get out of this contract and they stop debiting my account thi huge amounts.

Hello Peter please do help me

Regards Ruth