Telkom loaded me onto a contract after clearly stating that is not what I wanted

I had previously utilized a Telkom 50Gig package on a month to month basis due to the fact that I already had a router of my own and it gave me the freedom to change the package whenever I wanted or cancel it when the need arises. Due to my requirements I decided to move up to a 100Gig package. I went into the store to do this and repeatedly said I only wanted it to be month to month and I was also guaranteed that this was the case before I left and that all paperwork was standard just to update my details etc.. My first indication that I should be suspicious was that the person assisting me was clearly on training and appeared to be very confused at the process. I had no further issues until this month when I decided to upgrade once again to a 200Gig month to month package and I was informed that it indeed had been loaded onto the system as a contract, and in usual fashion the assistants in store just pull up their shoulders. I was impressed with Telkom until this incident, why should I have to now suffer due to their staff incompetence? I would not recommend going with Telkom for mobile internet cause they clearly don't know what they are doing and clearly could not care less to rectify their mistake.