Contract cancelled without authorisation

I went to their walk in centre at NY1 City on the 24th of January because I was in Cape Town, to ask how much it would be to cancel my Internet contract the agent (Yonela) assisting me was struggling to get the amount and called a manger to assist , they got finally manage to tell me the balance and I told them I will not afford to cancel now I will continue with my contract, imagine my shock when I wanted to pay my monthly amount R1700 is the amount due, called the call centre , spoke to 4 different people , used chat all of them no resolution I must travel to Cape Town to reinstate the contract, this is not the first incident of incompetence with this business, customer service always sends you from pillar to post, I requested an escalation no-one has bothered to call me. I am furious.