Unable to cancel contract that expired

I cannot express how mad i am as i have inform ed the Glen Vodacom branch on many occasions that the phones are ****** and the contracts expired.They keep insisting that i call an 082 number that one is only able to call from a mobile(the phones are ******)i could not do sim swaps as that cost an arm and a leg and not to mention all the data i have lost because even thou my contracts expired they were still billing me for data. I keep explaining that i am not able to call from a vodacom number and if i am not able to cancel via a landline or email ,then how is that possible. Some lady calls me today claiming i owe vodacom R460 and i need to pay.The freaking nerve of these people.