Double premium

I have paid for my account however there is still amount of R450 outstanding. Which i do not know where it's coming from because i only have one active decoder . But multichoice decided to double my premiums for current month and you guys are saying you will switch off my services if i do not pay this outstanding amount. I have tried to get assistance through the chat option however the agents are pathetic they keep telling me i should pay , they have not assisted me at all . If my services are switched off by today please make sure that you refund me my money . I do have proof of payment if requested .