This company has no integrity or customer care. Time will tell

Earlier in the year, we signed up for the Rain 5G. It was a disaster from the word go. We moved the router all over the house with no joy. 90% of the time we had no internet. Every time we phoned in I was told a technician would be sent out. In total six times, we were told this. Then I asked if it could not be a faulty monitor and I was told logistics would contact us to arrange delivery of a new router. Nothing ever happened. Based on this we decided this was really not working for us and we had already spent a fortune on data. I phoned into cancel and was told they would make a note on the system but I must also cancel on my phone, which I did. I have phoned in nearly every month since then to ask why they are still deducting money from my account. They say the same thing it is canceled and they will send someone to collect the router. I have been with Vodacom for 3 months and I am paying two ISP. I am 70 years old and on pension, Rain is forcing me into debt, and the bank will do nothing to help by canceling the stop order. I have emails going back to March querying this. They send an email with a ticket number and I hear nothing else. They phoned on the 1st August and as soon as I picked up the phone the call was cut. What can I do to resolve this? I cannot afford another installment to go off month end.