Bad and worse customer care by Vodacom

I have cancelled a contract with vodacom,they have taken back the laptop ,I have taken on other contract of 15000 to suit the needs of my so .Vodacom has accepted cancellation and paid back my two monthly contributions. But now they started a new tune ,they are deducting 15000,to 17000 ,monthly and I dont know for what?I tried calling with fail.I returned the first debut of 15000 indicating that it is not the correct amount but they continued this month to deduct 17000.affecting all of my debit orders for the month and with interests for unpaid debits who else can pay 17000. monthly.Cusyomer care is dead at vodacom.They dont care,how do I survive without my 17000.I guess the current contracts will be the last ones in vodacom.I will switch to on other company.