Paid account, but on pre legal, cannot use phone

I upgraded in Jan'16 to a Smart XL package and a Apple 6 as well as a WiFi router 2G. They went to a new system and I was classified as a 3D client. Vodacom Head Office loaded the contract incorrectly and I ended up using my phone on the 2G WiFi contact. This I only realised when I received a message that my phone is locked from Vodacom. They rectified the contract and swopped them around so that my phone is on the Smart XL and my WiFi on the 2G top-up. Since they swopped the contacts I do not have Id Caller Identification and can not see who is calling. I lodged a complaint at Vodacom in Cradle Stone mall, at Key West Mall and at Village Square where I did the upgrade during end Feb 2016. We are now in April and it is still not sorted. Needless to say I got a massive account which is deducted via debit order every month. Now yesterday my line is cut off as I'm loaded on pre legal for outstanding monies. This is impossible as my account always go off via debit order. When I asked the Vodacom consultant at head office she said that I'm not in arrears it is just the way they loaded the contract when they went over to the new system.