very angry

good day this nomagugu nhlapo id number is ***

so i did an upgrade online last week or so,i upgraded to an iphone xs max the monthly premium that iv got was R1099 so am fine with that so to my surprise when i went to vodacom app just to make sure how much is my monthly installment i sow R1400 and some change so when i call vodacom i spoke to one of customer care consulted she told me that she she sees is that am still paying for my old contract,,,, like really so i wanna understand how can u say i qualify for an upgrade @ the sametime time i still need to pay for my old contract can someone call me urgently couse am not excepting that am really not happ with that why dont u guys disclose the full info so i can know if am upgrading il be paying for two contacts i even went to ur web side it doesnt say anything about that cn u please resolve this issue before i even take it further than this