Paying for a service I no longer use is beyond ridiculous!!!!

Your service is below standard honestly. I upgraded my services to RainOne in November last year. My understanding with upgrading is that the previous service I had would be disabled. Till today I'm paying for my old service and new one - just under R1000 which is absolutely ridiculous!!! I called in Dec and was told it's cancelled. My payment went through today and it still HAS NOT been canceled!!!! I cannot pay for a service I am not using!!! In what world is that even right!!! I have been a loyal customer and this is the service I am receiving!! Shocking!!! At this point I regret even upgrading my services!! It has been a nightmare. Ii need my Dec and Jan repayment to be rectified please!!! I WILL NOT pay for services I didn't use. I refuse. I'm sure you have a way of checking and confirming that I didn't use my old service. Please make this right!!!!!