Vodacom poor service

I had a contract that I paid off before it's time and asked to be cancelled last year on 12 October 2018 and the amount I paid was R3816.77. I went to two Vodacom shops in Sandton none of them could pick up that I still have a contract with them. I dedcided to call the help line and about five Vodacom agent coudn't help, they gave stories that my contract is withthe old system(m2) and they can't access it. The 6th Agent by the name of Sibongile took down my contact and it's 2 hours now no one has called. Let me put it to you Vodacom I paid and settled this account I*** and it's your unprofessional staff who failed to his/her work and plaease check the recordings as you always claim that calls are recorded.