Very disappointed

On the 17/10 I called in to cancel my services because I've had many days where I didn't have any network and my fine was installed on the 15/10. The lady I spoke to sd that my service is canceled with immediate effect, on the 22/10 I called again to find out when they will collect the router the lady sd it will be organized with courier company and I asked specifically about my bill and was told that it will be back dated to the original date of cancelation and she send me a ticket number as proof that I called in. On the 01/11 I was debited almost the full amount and I called again and the lady said that she can see that I canceled on the 17th but it shows on their side it was only done the 24/10 hence the big bill. Sd she will escalate it to billing department which will take up to 48 hours. Today the 05/11 no one has called me back and when I called, the lady told me that they only canceled on the 24th so they cannot back date it to the 17th when I was told I will be billed until the 17/10. I do not think I should fit the bill for delayed processes at Rain when I called in to cancel and they never canceled and left the Sim card running. It is so disappointing to receive such terrible service after being a loyal client for almost year, disgusting