Rain Internet Services Provider debits cancelled accounts

I used Rain Internet Service Provider for one month (May) as I was working from home and I needed sufficient data to cope with my workload. I cancelled my subscription in June as I decided to get fibre instead. I politely stated this as my reason for cancellation. I received confirmation via e-mail from Rain that the cancellation had gone through and that my Sim card was deactivated. The e-mail was headed "No Hard Feelings". I assumed that the admin was over. However, I was shocked and angry that on the 1st July I was billed R479 from Rain which is the monthly package that I cancelled. I e-mailed them to complain (using the address that they had used to contact me) and I received an automated reply stating that they do not communicate via e-mail and that I must post a message on their Support site. I did this and received a reference number and an automated reply stating that a consultant would respond to me in 24-48 hours. That was over a week ago. I phoned them but they do not handle any queries telephonically either according to their automated system. I then sent them a few direct messages on the Facebook page and again no responses. My only choice was to post a message on their Facebook page as I hoped that a public complaint would result in a response from them. In the past week I have posted several messages on their Facebook page and all I receive is meaningless apologies about their delays and that they will get to me as soon as possible. Apparently they have many customers to attend to. Again, I assume that these are automated responses. I have no idea how to actually speak to a consultant. I want my money back from them and I want them to acknowledge the fact that my account is cancelled so that I do not get debited again in August. I have wasted so much unnecessary time following up. I spoke to a colleague and her experience is the same as mine. If anyone is considering using Rain data as a means to work from home, I would rethink your choice. The admin is not worth it.