Services Disconnected

My services were discpnnected on 18.02.2016 when i called multichoice i was informed that i owe R1000 plus my month subscription, my payment date is every month on the 21st, i spoke to a superviser by the name of Goitsemang Khumalo and she told me she see that there was a systm error done in September 2015 were the amount of R1000 i paid was duplicated. i told her i called called the call centre in October and i was told that i have a credit on my account, so i did not make a payment. the next payment i mad was on 21.01.16 for R1663.00 that was the amount i was given when i called the call centre. Goitsemang saud she will ascelate the matter to the finance department. after the 21.02.16 i called the call centre to ask if i should pay my month subscription and the agent i spoke to said i must wait for the finance depart to call me. I got a call from Goitsemang and she said unfortunately i need to pay the extra amount of R1000 and my services were disconnected, i do not dispute that i have to pay that amount but i do not have that R1000 now, i should have been given an option to pay it off monthly as this error was done by multichoice.