Displayed balance not matching what they tell me I owe

According the DStv self service portal my balance is R892.89 due 27 Dec 2017. Yet, I was cut off on the 10th of Dec. I made a payment on the 15th of November to catch up my account and was reconnected, so at worst I should have to pay again on the 15th of December. I went into the Randburg service centre and asked them to reconnect and they refused, saying I owe them R962.89 - according to their back office system. My latest statement, dated 29 November shows an amount due of R38.80 - NOT YET DUE. So what they are displaying to the customer in the self-service portal is not what they are telling the customer. I asked them to at least connect me to the 15th of December and then I would pay again - they refused.