Inconsistent Information on account

I've had a contract with MTN since 2009 and have been good with paying. This year between March and April I missed 2 payments which I advised that I will make an arrangement for. I got a call on a Wednesday sometime in May from an agent advising of the late payment and I told him that I would pay on Friday, they blocked my number, I made payment as promised on that Friday for the amount of R921.00 as per the sms I received, still my number was not unblocked and they blamed the strike for not being effective, I was told by a different agent that I need to pay another R210.00 in order for them to open my line and that still didn't happen. I have called them numerous times and have sent emails but no one gets back to me unless if I follow up and I still don't get answers as to where my account is sitting. When I call the MTN customer centre I'm told that my account is at the legal department but no one has communicated anything with me. I emailed the Legal department and they tell that I owe R1207.80. I don't know where that amount comes from as I have not been using that line for over 4 months now. I'd really like to know what is happening and for an explanation on my account.