No service

Four months ago I decided to cancel our cell phone contract with Cell C. We phoned the branch and asked them what we needed to do in order to cancel the contract. The shop assistant said he will speak to the manager in order to confirm how this should be handled, which I thought was really strange as they should know how to handle a small query such as this. After a few days I had not heard from anyone so I physically went into the branch in order to cancel the Cell C Cell phone contract as I was nearly due for an upgrade so I wanted this done before they upgraded the contract. I spoke to the manager who said he will cancel the contract once he listened to voice recordings to confirm we asked for the cancellation. So I took it that they would handle the situation and get back to me if there were any issues or paperwork that needed to be filled out. Nothing happened for a few weeks so once again I went into the branch and spoke a different shop assistant. Never the less they upgraded the contract without my knowledge or signature. Too make a long story short I am still battling to cancel the contract with no feed back. Can somebody please assist me. Kayle Faul ***