Their billing error that they expect me to pay for

At 8 pm on 30 May, my internet stopped working. Error message was ‘no internet’. I had cancelled another rain contract ( thru webafrica) that I had as of 1 June- so assumed that rain had mistakenly cancelled both my sims. For the next few days I had no internet. Instead of trying to reinstate my service, I regarded it as quite fortuitous as the service was awful. I could not stream a uTube video without buffering. I cut my losses and signed up with someone else. Almost 50 days pass by and suddenly I get a message from rain saying that I owe for June and July. Understand 2 things 1. My sim has not worked since 30 May and 2. They have a stop order on my credit card account. They have not processed the deduction on the 1st of the month as is their billing requirement. So- I have had no service from them for 2 months, THEY failed to do the deduction and now they want me to pay for a service I did not receive. Impossible to get hold of them, ( no email or phone numbers listed) no response to my message on their website, unable to find ANY way to CANCEL with them on their online portal- so I eventually FB message them. They confirm that my sim is blocked FOR NON PAYMENT- that they failed to take ( their error not mine) and say I need to give another month’s notice if I wish to cancel!!!! Cancel what? I have had no internet from you in 2 months because you failed to process my payments. Stay away fro RAIN. The internet is so unbelievably slow, you get billed for their mistakes & it is impossible to cancel. I was about to sign up for 5G with them. Be warned- DONT’T DO IT!