False information and disloyalty

I called vodacom customer care to enquire about premature cancelation on contract. I asked the lady who was assisting me if it's possible I can cancel my device and remain with the monthly benefits (data and airtime) and she said yes its possible and she sent me the quotation showing two amounts, the amount if I want to cancel everything and amount for canceling the device only and within 48hrs I paid that amount. I called back to find out the updated monthly installment since now I removed the device to my shocking I was told that I paid upfront I can't cancel should I known when I inquired I should have not paid coz it defeats the purpose.....Everytime I call to be assisted about my query I hold and hold and hold ..