Cancellation Letter outstanding

I took a rent to own from Planet 42 about a year ago.I had endless promises and lies from them.I stopped paying them as the car had was not roadworthy and asked them to give me another car or fix the car.Unfortunatly due to the damage of the car they did not fix it.They assured me that all arrears and cancellation letter I would receive and Nosipho one of the sales persons was so humbling on the phone.She sweet talked me into letter the car go and said that another letter would be given to me once they get the car and we part ways.No such thing.She is a devious snake that did not keep to her word.They have the car and I am emailing her for the letter with no response.Instead they are sending me messages and messages about my arrears,which I was told will be sc****d and we part ways.No such thing.They are the worst people to deal with everything.People stop taking cars from them as you will be sorry.Worst company on the planet to deal with.