Charging me after i have paid off my contracts

I paid off all of my contracts in the beginning of 2015 @ Foresthill Vodacom.I asked the lady is it done now,I wont have to pay anything extra or anything again, she said no.End August a debit order went off my account,over R1000.My one number is used by my husband which was an open line.I thought that he was making the calls but he said no.I left it and so it went on every month until I phoned them last month.The guy I spoke to asked me if the lady gave me a number to phone to stop my accounts after I paid it so I said no she stopped it in store.So he said she was supposed to give me a number to phone to stop my accounts.She never did! The guy I spoke to on 082111 stopped it for me and activated 3 of my accounts and I took out a new contract. He said that I was only going to pay R700/R800 a month, but this morning another debit order went off of R1245?I phoned Foresthill Vodacom this morning and spoke to Junior.He said he will look into everything and get back to me, but still didn't.When trying to phone their number it just keep on ringing.I need them to pay all that money back to me as no one told me to phone and stop my accounts after they confirmed instore it has been stopped