MTN Contract *****. Contract added in my absence with no signature.

I went to MTN Orange farm Eyethu mall with an interest to add a data Sim and device to my existing contract. I was told I would first have to buy a prepaid Sim, Rica it and let it be active for at least 24 hours before they could assist me. I got the Sim and waited while they went through with the Rica process. The process took so I told them I would only be doing the Rica that day and would come back some other time for the contract. To my surprise, I received notifications that I had been authenticated, and later found out that they went through with the contract in my absence and data was sent to the Sim I had Ricad the previous day. Upon calling MTN I was told I would have to pay a R900 cancelation fee, and that I should speak to the store manager. The store manager insists that they went through with the contract because I was there the previous day and said I wanted the contract so they processed everything ( I was not even called to sign a contract and fetch the router that comes with the deal). What baffles me the most is that on the day they processed the contract, I had gone to the store a few hours before that to look ask if I had not left my glasses there, at which point I feel they could have mentioned something about their intentions to pceed, or asked me to stay and finalize the process, but they did not. After I left, they then went through with it. How am I being charged for canceling a contract I have not even signed. All I got from the store manager was words (he promised to give me the money ghat would be deducted from my account for the cancelation fee). What they did was ***** and the store manager is trying to cover it up. Calling customer service is useless because they just refer you to the very same store manager.