Seems like Vodacom dont know what they doing

I dont have the dates it happend but i changed my debit order more then a year ago to the last day of the month as i moved to a new job i never check the statements of my account because there shouldnt be any problem 3 months later the legal department contacted me and said i didnt pay my account of wich it was not my fault cause they didnt change the debit order date so i made a payment of R1500.00 and told them that the debit order must go off on the last month then i contacted vodacom last week becuase i didnt get my Data then the call centre didnt want to help me and just told me that i should contact the legal department after contacting them they said i owe them R2800 so they never put on the debit order again for the second time Got the statements to proof that there was money in my account every last day of the month for the debit orders to go off like i said i never check my statements to see if the money is payed to them and the number that the smses go thru to is stollen got no problem with any other debit orders all my payments is up to date Went to the bank to make a loan to buy a new car but it was declined because i am now black listed because of vodacom