Most confused, *********** consultants ever!!!!!!

My services, was switched off last night, I have phoned vodacom, and asked them what is going on.. They told me that my account is in arrears. I have told them that I always pay my vodacom account. My bill every month is around +-R218 a month, now they told me that I owe them +-R1400. My vodacom account don't go off from debit as usual, so I phone them each month to ask them how much i owe on the account, and how much i am in arrears. I have paid them every month the amount the they said I must pay up, but still they say I am in arrears. The one lady even said I made short payments, but the is the amount that vodacom gives through to me. I am really sick and tired of vodacom, wanted to leave them, they have made mistakes on my account in the past, and I had to help them right. They have billed me for a number that I have cancelled, and paid up... So the accounts department is really really really confused, and don't have a idea what is going on around them. I see that as extremely unproffesional for a big organisation like vodacom. I told them that I can't pay that full amount, that they are requesting, which I still think is a mistake from them.. They never offered any solutions on how to help me, and they don't want to investigate... I have being a loyal vodacom customer for about 13 years now, but I think enough is enough