Horrific experience I got from Vodacom

I had a sim only contract with Vodacom which did not meet my expectations as the network was very bad at my residing location. I have been in contact with Vodacom about the area I stay in and there was no solution to my problem, then later on opted to cancel the contract. I even went as far as paying the pre cancellation fee and sent them all the necessary documents for cancellation. To my surprise my credit score started going down and on my profile the Vodacom contract was on arrears which I know nothing about. I would advise people to be aware of this kind of behaviors from Vodacom. As of now I have a bad profile because of Vodacom.