UNAUTHORIZED UNCAPPING

My numbers were suspended. On 25 April 2016. after calling the MTN branch i have used for nearly 4 years they managed to find out that my 083 number which has been always capped at R1 was mysteriously uncapped! now the bill is sitting at nearly R2600. MTN Balfour has advised that the system clearly shows it was uncapped by the system in March 2016( without my consent) . which mind you is the second time. I believe when i upgraded my 083 number was uncapped however all mtn is telling me is to pay .can this be urgently investigated and i would really like to know who will be paying this ridiculous amount after such negligence. I was informed I upgraded on 7 April 2016 hence the uncap. my upgrading should not affect what was instructed to mtn -to cap it from day one. however the uncapped number is 083 not 078 how does that justify the uncapping really!!!!!!. I did not authorize any uncapping on this number 083 I was not alerted to the uncapping. I therefore refuse to pay a bill that was born out of the negligence of an MTN employee. I will be paying what is due monthly by cash until this matter is sorted.