Worst service ever

I canceled my Rain end of November and I was billed for December. December I called in to find out why I was billed and I spoke to one of the agents and they explained. I asked them to make payment arrangements, got an sms that I'll be paying R250 for 6 months. Come the 31st of December I get billed for January. I call the offices of Rain on the 31st of December no answer , called again today 2nd of January still no answer but I do get sms's saying on of the agents will call me. I am willing to pay just to clear my name, but why am I being charged where as I asked them to stop the billing and I pay as I agreed. I'm not happy with Rain hence I canceled now I'm being punished for canceling. Worst service ever I wouldn't recommend any to be in a agreement with rain😡😡