Poor service

I was on rain 4G for more than two years then I joined Rain 101 in December last year and i asked RAIN to disconnect 4G and they agree, but unfortunately they did not disconnect it and i only saw that in January when i received an sms saying i am owing R625 + R285 then i called them immediately to ask them to sort the matter and the call center agent i spoke to was helpful because everything looked ok but except that we both failed to cancel the 4g subscription on my app the system did not allow me and he said it was ok i must bot worry. Boom this afternoon i just received an sms saying i am owing R1139.00 and they disconnected my service and had to call them ASAP, the call center agent i spoke to was not helpful at all, i demanded to speak to the senior staff he refused and said i will be contacted, i am so upset and frustrated about RAIN. They are really don't care about their customers and they don't deliver their system is very poor that even themselves they cant help it. Worse part