Being ****** by vodacom and their collectors

I had a Contract with vodacom that ended up not being closed in 2017 as i was out of the country wheb the contract eneded and they were forcing people to come instire to sign to cancel the contract. So they continuee billing the contract and i was no longer paying. I called and assuming they record alll calls, they can put it on record that i want the contract to be ended (as i can agree verbally to a contract over the phone but all of a sudden have to go instore just to cancel, and i have a right to cancel asthe contract has ended).they didn't end it,it was handed over and I've had their collectors call me and to avoid having a bad credit record i settled the amount with the collectors.the collectors have not sent me a paid up letter, I have communicated with vodacom telephonically over many hours with now help. They are continuing to bill the account and make my credit look bad, I'm out the cou try half the time and have limited time to deal with this with little to no assistance.ive been trying to resolve this for over 2 yrs now and keep being giving the run around I'm sick of it.