Terrible service from Multichoice

I am currently on the pricelock plan and pay R778 per month on the month of September multichoice did not debit therefore i made a cash payment of R850 i called and was informed that i need to pay an additional R300 i then paid R350 i am still disconnected when i call im told that price lock is a department on its own so they cant help today i called again and was told to pay 283 i paid 300 and still cant view may i please get help on how to escalate this