QUERYING PREMIUM INCREASE WITHOUT PRIOR ADVICE

Multichoice has just increased my premium by 100% without informing me. I have been paying my premium religiously each month. My premium has been R565 and they've always debited my account for this amount until this month. When I realized that they had not debited, I tried to enquire and I was met with the information that I'm supposed to pay R1314. I am not sure why because nothing was communicated with me prior to this change or increase. I need clarity on this and I need it urgently because they have suspended my account now.