Rain service less than poor

I cancelled my account in begin of March just to find out the other when I want to reactivate the account or apply for a new rooter it has never been cancelled. I tried calling, submited tickets on the app and send mails and eventually a lady phone me about a month or so back and informed me that I have an outstanding balance which I was willing to pay as it was before the account got cancelled. Now about 2weeks ago I went to a branch to apply again and I told them Ill pay the outstanding amount which I did while standing there. Now I received a bill of over R800 and according to the consultant it is because it was the usage of the last week of Aug plus an installment. I refuse to pay it as I did cancelled it but it was never cancelled. They can come and get the rooter for all I care. If that is a way to ******* their clients I will not support them or recommend them to any one as their service is just as poor as their after service. If there were an option for no stars I wouldve selected no stars at all. To call them is useless. Why have an app to submit tickets if have queries if no one is getting back to you. Why have an email address if you receive no response from them? Why even existing? Close the company or sell it to someone that cares for its customers.