vodacom cellphone contract failed me

Last year 2016 after losing my Job I phoned Vodacom for payments arrangements the sooner the Pension funds payout. On the 1st September I made a call as per arrangement, the lady I spoke to I explained very well that I am no longer working and would like to request for settlement amount and would also like to close the account but keep the simcard for prepaid. The penalties were explained and i agreed and also told the lady that the funds are available on my bank account for immediate payment. Funds were deducted over night from my account. in February2017 month there were funds again being deducted from my bank account , I did not understand as to how vodacom can deduct money on my account while the account is settled , I then reversed the funds and after 3days i got the call and the gentlemen said to me that i owe vodacom , because 1gig was loaded monthly on my contact, I had to explain again to the gentlemen and he said he will do the investigations. Now its month October 2017 and I am told that i have been handed over and that I am owing R700. I still fail to understand how come I am now handed over and also forced to pay this R700 if I told the Vodacom consultant that I am no longer working and i requested that the account be closed. Please help.