Rain wifi waste experience

I contacted Rain to tell them to stop billing me for a wifi I have not been using since February, they told me to use Rain go I did all that , but the app doesn't even allow me to cancel but still there are charging me 650 for a wifi I'm not using . There are saying I must pay for my arrears first ,I tried everything but they do not even respond to queries, I have been given 20 email but nothing ,to my surprise even their contact number it's a waste of time ,no one even gave me call to sort out my problem.